Marathoning something right before going to bed and/or letting it play audibly while you sleep could help.

I know I've had some of my dreams influence by songs/music I had playing while I slept. (Might help if it's only ambient music, lyrics in a language you understand, or a song you're very familiar with and know the meaning of.)

I think I had a dream once where I was watching anime in JPN because I fell asleep at the keyboard with Winamp playing and it eventually started playing some of the JPN Radio/Audio dramas I something get as part of my OST CD collection. Not sure if the characters in my dream matched the series the drama was from though.