In a recent video, I covered how to figure out what key would be the right one to sing a tune in. You can find that video at the link below:
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In the video above, I take the inverse and say, what if a singer comes up to you and starts singing a tune in some key, and as a piano player, they want you to start playing along with them?
Backtracking is a great tool to use to make your piano playing sound more interesting when you are stuck on the same chord for multiple measures.
For example in blues tunes, you are on the same chord for several measures here's a technique you can use.