I am looking for some high quality pictures of Prince either an album cover like Sign O The Times, his blue Cloud guitar or maybe an action shot of live.

Where can I get??

I am planning to print onto a 4x4' accoustic panel.

tx

This is not meant to sound snippy at all, but have you tried Google and adjusted the search criteria to search for higher-res pictures? Specify over 4MP or more. You can get lucky sometimes. I found a few that could easily go 4' x 4'.

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If you're doing direct-to-substrate, the resolution requirements are probably a bit lower than a traditional print on paper.

the one that was promoting one of the recent singles 'fallinlove2nite' ? was really hi-res

This may not be exactly what you are looking for but please consider