This neat little game was released on Steam quite recently. It's currently on sale for only $8. The soundtrack is all chiptunes and it supports customs with its in-game editor.
http://store.steampowered.com/app/372690/
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Guitar Hero + Rock Band Expert Drums Dual FSFC - September 21st, 2017
10,000 unique expert GH/RB FCs - May 18th, 2022
Videos:
http://www.YouTube.com/dayzeed
FC spreadsheet:
https://bit.ly/FCs
Proud lefty who conformed to right-handed mode... show some respect! ;)