I'm loving all the Android apps I've been downloading...If you are a musician and have an Android cell, you MUST have these
Musical Pro
This app totally rocks! I'm a guitarist but I'm willing to learn piano, since I don't have one this is like a good first try. Besides where ever I am I could practice a song. It also has a metronome, a tuner, drums, and a few more stuff.
Chord!
As the name indicates, it help you with chord fingering (Major, minor, 7, sus, etc, etc, etc) and it reversed versions. These same options apply to scales.
ChordBot
I can't review this cause haven't tried it yet, but I'll add the official description:
Chordbot is an auto accompaniment app for iPhone/iOS and Android that lets you create and play advanced chord progressions easily. Chordbot is useful for songwriting experiments, as accompaniment for your guitar/saxophone/theremin solos, or as a backing band for your shower singing sessions.
SPC Music Sketchpad
This is for entertainment purpose only. You can create music by clicking at the instrument options you have there, it's fun!