what are good solos in Am?

I want a good challenge, but not to hard. I can do some beatles solos, but i just need a little bit harder than the beatles solos.
If you like Blues/Rock then add me as a friend. I need to talk to some Blues/Rock Musicians and need reccomendations.
Stairway to Heaven is A minor.

And why only that one key? Why can't you play solos in other keys?
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