On my phone, I use PowerAmp as my music player, mainly because it lets me press my Galaxy Ear Buds and say skip back 20 seconds if I miss something in a lesson, or skip back 10 minutes if I am really struggling.
I noticed it had a lyrics button, so I added the vocabulary for the lessons to the mp3 download files. Now I can pull the vocabulary up direct from the music player. I also tidied up the album/track/artist tags whilst I was at it.