This app was mentioned in 5 comments, with an average of 1.60 upvotes
https://play.google.com/store/apps/details?id=biz.mobidev.mdplayer
MDPlayer. Works with AA, and allows you to play local media from your phone.
MDPlayer is the only music app I've found that works with Android Auto.
https://play.google.com/store/apps/details?id=biz.mobidev.mdplayer
It's listed as MDPlayer in the play store