Below is a select list of publishers with a link to their web pages. For a more complete listing, see the online directory of the Music Publishers Association, located at http://www.mpa.org/directories/music_publishers/.

A-R Editions (www.areditions.com)
Mel Bay Publications, Inc. (www.melbay.com)
Boosey & Hawkes, Inc. (www.boosey.com/)
Cantate Music Press (www.cantatemusicpress.com/)
Classical Vocal Reprints (www.classicalvocalrep.com)
ECS Publishing (www.ecspublishing.com)
Ensemble Publications (members.aol.com/EnsPub/)
Carl Fischer (www.carlfischer.com)
Theodore Front Musical Literature (www.tfront.com)
G. Henle USA, Inc. (www.henleusa.com)
Hildegard Publishing Company (www.hildegard.com)
Hinshaw Music, Inc. (www.hinshawmusic.com)
Edwin F. Kalmus & Company, Inc. (kalmus-music.com)
Kendor Music, Inc. (www.kendormusic.com/)
Robert King Music Sales, Inc. (www.rkingmusic.com)
Hal Leonard Corporation (www.halleonard.com)
MMB Music, Inc. (www.mmbmusic.com)
Music Publishers Association (host.mpa.org/)
Oxford University Press (www.oup.co.uk/)
Peermusic Classical (www.peermusicclassical.com/)
Pendragon Press (www.pendragonpress.com/)
Pepper Music Network (www.jwpepper.com/)
C.F. Peters Corp. (www.edition-peters.com)
Theodore Presser Company (www.presser.com/)
G. Schirmer, Inc. (www.schirmer.com/)
Shawnee Press, Inc. (www.shawneepress.com)
Southern Music Company (www.southernmusic.com)
Warner/Chappell Music, Inc. (warnerchappell.com)
Warner Bros. Publications (www.warnerbrospublications.com)

The Rough Guide to Music contains discographies for both Classical and Jazz musicians, supplemented with biographies of jazz performers. It is a good starting point to see a listing of recordings of certain performers. Just a few other websites for recording labels and distributors are given below.

A&M Records (www.amrecords.com/main.asp)
Allegro (www.allegro-music.com)
BIS Records (www.bis.se/)
Blue Note (www.bluenote.com/)
Claves Records (www.claves.ch)
Columbia Records (www.columbiarecords.com/)
Composers Recordings, Inc (www.composersrecordings.com/CRI.html)
EMI Classics (www.emiclassics.com/index_left.htm)
Harmonia Mundi (www.harmoniamundi.com)
Hyperion Records (www.hyperion-records.co.uk/)
Koch International (www.kochint.com/)
Lyrichord Discs (www.lyrichord.com)
Naxos (www.naxosusa.com/)
New World Records (newworldrecords.org/framework/indexBUY.html)
Sony Music (www.sonymusic.com)
Verve (www.verveinteractive.com/)