Music Writer - Music Composer is a free music application developed by Music App Developers for Android devices. With this app, you can compose, create and edit sheet music on your phone or tablet, and export it to PDF, MIDI, MusicXML or MWD.

The app allows you to add, remove, and edit notes on two independent layers, change time signature, key signature, and clef for individual measures, copy, paste or remove parts of the score, change the instrument for a staff, add expression, articulation, slur and repeats to the sheet music, add lyrics, remove or reorder staves, and set title, subtitle, and composer. Moreover, you can show or hide tempo marking, support grace notes and tuplets, and support multi-page, single-page or horizontal layouts.

Additionally, Music Writer - Music Composer supports MIDI connection to an external device and recording audio from the device's microphone to add it to an audio track in the sheet music. You can also set the playback volume on individual staves, mute a staff, or set the playback to solo, show or hide individual staves, set the tempo and play the score.

Overall, Music Writer - Music Composer is a great app for music enthusiasts who want to compose and edit sheet music on their Android device easily.