ミュージモン
From: Appmon Chip Reference Book
A musician whose motto is "Music changes the world". The music he composes vigorously moves the hearts of those who listen to it. 

Anime version:
No Musimon! No Life!
Torajirou's Buddy Appmon. It has the abilities of a music app.
It has a high-spirited personality just like Torajirou. 
musimon