License free and nNo authoring mention is required to use them (you're even strongly invited not to mention who you got them from

I post them in .zip file because the forum doesn't allow to attach YM file .. but they actually are YM file that you can convert with ym2mym and transform in buffer with header in order to have them played with the mymplayer
These are 16 bars long music at tempo 120.
PS: Just an advice .. If you plan to use these music, don't forget to add an easily accessible "Music Off" feature in your game .. or some Orics are going to fly through windows.