Ambient & lighter Electronica is easier on the mood and the repetitive patterns help pacing myself (it also works for working out/ running). Jazz gets too involved; HipHop as well; Rock has dominant vocals that grab attention.
Probably because I haven't really listened to Bach (youtube et. al. are blocked for me so I can't go and listen right this instant).
Classical composers other than Bach would probably work, but since most of the classical music CD's I have are Bach CD's, I can't say I have tried listening to many other composers, to be honest. I like Mozart, but his music is too "happy". Bach's music is more mature.
My recently instrumental fascination has been the work of Yann Tiersen (Amelie soundtrack), which has recently inspired me to try my hand at the piano again after 20 years. Not sure if that'd float your boat though. May give Brahms a go though.