And, though it's on the link thette gave you, I'll reinforce it...

http://www.echoschildren.org/Songdex.html has the following songs:

"Alys's Lullabye" (Memory)
"Butterbug Blues" (A Civil Campaign)
"How It Is Applied" ("Labyrinth")
"Mark's Song" (Mirror Dance)
"Quaddie Ballet" (Diplomatic Immunity)
"Two Falls Out Of Three" (Memory)

All of which are available as part of EC CDs.