Removing vocals from an existing recording and just using the accompaniment with you singing along is still using a copyrighted piece of material.

Will the copyright police show up at a small venue of friends? Probably not, but it's your decision. Me, I would rather use ACW to get the chord progression (or find it in a fake book) and create my own original arrangement of the song. If all they want to hear is the original CD, then they can play the original CD. But that's just me.


John

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