Yes, but the modern-day usage means to perform in the street nothing to do with selling anything. There's also an old Scots song with the line "Busk, Busk, Bonnie lassie, an' come awa' wi' me, An' I'll tak' ye tae Glen Isla, Near bonnie Glen Shee". I don't think the lad was inviting her to sell anything or play him a tune either!