In the US observing someone showcasing a skill in public is usually not enjoyable but there is less of an emphasis on decorum and politeness and more of that good ol'libretarian individualism so going out into public and demonstrating how heart stoppingly amazing you are is a pretty common occurrence.

I think this is a bit different than busking which tends to be relegated to locations where people aren't required to hang around for long periods of time (like outside a metro station where someone enjoying your music can stay and chill for a while or just continue into the relative quiet of the station platform.