How can I sort / specify separate storage locations for my audio files? So, this question is a little off the wall, so I'll first explain what I'm looking to do.

I have a bunch of MP3s from a 'Learn to Speak Japanese' program, and I'd like to listen to them on my phone while I'm in my car. Ideally though, I'd like to keep them in a separate music player app so that they're not linked to my Google Music or scrobbled to Last.fm. If possible, I'd want to be able to set a custom directory for the app to look for music in, so that I could keep my music and language-learning MP3s organized into their own directories.

Is there a music player app that does this, or am I asking for something too ridiculous? Should I just suck it up and use the default music player?
MortPlayer allows you to specify folders that should be read/ignored.

Note however, that if you use the default player, it will still scan and display the tracks. You might also consider adding the files into a playlist and then playing only that playlist, if you don't want other songs/files to be included.