You can always contribute to our fundraiser to record the first integral of Mahler symphonies on bagpipe orchestra. Our arranger, Max Richter, had to transpose them all into the key of B-flat, but I don't think anyone will begrudge us that liberty when they hear the strains of the Todtenfeier ringing out across the Scottish countryside, or the tasteful drum machine that now accompanies the 'Resurrection' chorus...

Our next project after that comes from eccentric old maestro Hans Apfelküchen who, after exhaustive study of the Bruckner symphonies, has concluded that the composer actually meant for them to be played approximately five times as slowly as they generally are. The first release in this series will be a 7-CD set containing the Symphony No. 6 (we regret that due to length the first, second and fourth movements had to be split across CDs) and a small quantity of cannabis.

Sinfonietta - Hindemith (Lustige)
1 - Brahms / Messiaen (Turangalîla)
2 - Schumann / Tippett
3 - Carter (Symphonia) / Stravinsky (in C) / Berwald (Singulière) / Myaskovsky / Gerhard
4 - Sibelius / Ives / Lutosławski
5 - Ustvolskaya / Dvořák
6 - Nielsen
7 - Nørgård
8 - Schubert (the C Monster, not the Unfinished)
9 - Beethoven
13 - Holmboe
14 - Shostakovich
39 - Mozart
84 - Haydn

assuming each composer can only be used once.

Alternative list:

Dvořák 1-9

Me too. Though I tend to prefer if the score 'scrolls' with the music rather than having only a single page presented, and if a video with score doesn't advance to the next portion of the score in time with the audio I may turn the video off.

(Youtube's sound quality is rarely good enough for me to prefer watching videos there—unless the recording is unavailable at higher bitrates I probably won't bother listening, same with mono recordings if I can find stereo remasterings)

Are Chandos and Hyperion really in trouble? They seem to be going pretty strong to me.

(No one is releasing new repertoire anymore apart from the boutique labels; that was an enterprise of the CD era ca. 1986-2006.)

Lajtha's string quartets are rather charming, certainly among the quite-good tier of the 20th century alongside figures such as Milhaud and Villa-Lobos. Not as distinctive in style as either of those two, but more interesting, imo.

There is of course Rossini, though he's not particularly unsung. In his lifetime he eclipsed Beethoven in popularity (which Beethoven was none too happy about).

For a short list: Clementi, Dussek, Cherubini, Méhul, Reicha, the unfortunately short-lived Pinto, Tomášek, Voříšek, Onslow, Hummel, Jadin. Though there are many others. (Ries, Dittersdorf, Czerny & others have been attaining wider recognition lately, though I've never rated their compositions particularly.)

Beethoven considered Cherubini the greatest living composer after himself, apparently, and his early piano music was heavily influenced by that of Clementi. Reicha was a friend of his in the Vienna days (and his music is in many ways much more "advanced" than Beethoven's or anyone else's of the period, incorporating polytonality, mixed meters and quarter-tones...) I don't know about the others.

No Johann Strauss II??? Are you insane???

Another name: George Enescu. 33 opus numbers, only about half of which represent his mature style (a rich vein of Central European impressionism unlike any other composer I'm aware of)—not perfectionism in his case, but an extremely busy international career and a difficult home life. Some works he didn't even bother to write down (like the Piano Sonata No. 2), retaining them only in his prodigious memory, which is now lost of course. It doesn't help that his music remains so little-known outside Romania with many of the unpublished works still in manuscript etc.

Dutilleux, Varèse, Ustvolskaya. A handful of surviving compositions from each, all the rest destroyed because of perfectionism.

Sibelius and Ives simply gave up composing after a while, living out their last few decades in silence. While they were prolific until then, I have always found that a disappointment.

And he did die young, but it is a shame Voríšek didn't start finding his "groove" until the year or so before his death—most of the early music is pleasant Weber-isms of not much consequence, but the B-flat minor Sonata and the D major Symphony are great works. Not every composer can be a Mozart and blossom at the age of twelve; I think Voríšek might have managed it by the age of forty, had he lived that long.

You would probably enjoy Nørgård's early works such as the Symphony No. 1 which display the influence of his teacher Holmboe.

For the mature works... an ability to appreciate Ligeti or Berio is probably a prerequisite; if they don't move you Nørgård probably won't either. The Symphonies No. 6 and 7 are supposed to be more accessible than the earlier & later ones but I do not know them well.

It is also my non-biased opinion that the New Zealand Symphony Orchestra is the best orchestra in Australasia.

I've come across a considerable stash of music by the composer Ștefan Niculescu (1927-2008)—not uploaded by me, but I thought I should share it anyway.

http://www.mediafire.com/?emczzbvuu3lzb

Niculescu's music has a unique style influenced by both the modern techniques of Ligeti and Xenakis and the folk-inspired melodies of Bartók and Enescu—it's difficult to make comparisons. You can read more about him on Wikipedia (predictably there is more information on the Romanian one)

As I am not the original uploader I don't know for sure if all of those performances are commercially unavailable; however I haven't been able to find any of them on CD so far.

Abraham had 2 wives, Muhammad had 4. King Solomon had hundreds. Not sure polygamy is a recent invention exactly :P

I have (what I think is) a concert recording of the Salonen concerto, as performed by the composer and the dedicatee (not sure of orchestra). Will double check to make sure it's not the same as the commercial one.

Salonen is considered Finnish rather than American right?

Don't know how many of these would qualify as too well known. I think once you get past three integral cycles you're pretty much "standard rep" in this world. ;)

Honegger on Apex/Teldec/whatever it's called now, & possibly others
Martinu on BIS & Chandos
Sessions on Argo/New World, mostly OOP now
Franz Schmidt on ???label???
Walter Piston on ???label??? possibly First Edition? I know all of them are on cd
Carl Vine on ABC
Poul Ruders has 1 on Chandos, 2 on Dacapo and 3 & 4 on Bridge
Henze... somewhere, possibly DG

Per Nørgård is almost complete, his most recent symphony hasn't been recorded yet but probably will eventually since the record companies seem to love him. Northern Flowers offers a lot of symphonies by Boris Tishchenko, but I don't know if they are planning to record the rest of them.

Plus the 19th century contingent: Raff, Hamerik, Gade, Spohr, Kalliwoda, etc. Mostly served by CPO.