In preparing for an ideal situation scenario for my labour (no need to point out that this might not happen: I'm optimistic, not delusional!) I'm putting together a playlist for my labour.
I started by putting together relaxing, new agey/trancey bits of music (think Enya, Chicane etc. Then understanding labour can take a while and some stuff on the same positive tone but maybe a bit more upbeat - after all maybe I'll want something to spur me on not slow me down 
Anyway, what did you go for? I'm I likely not to notice or give a ? Or should I just stick to the instrumental stuff?