Can't recall any name we use for them... I don't see them as being useful, but that stems from me holding a strong opinion against people who chose to live on the streets. but that is a whole different debate...
Buskers are not necessarily homeless panhandlers. All the ones I know here have good homes and don't really need the money. What they do have, though, is talent, and all they want to do is to share that talent with others. The fact that they can make a few bucks on the side in payment of their entertainment is simply a bonus.

