Don’t front. You know all of the words to “Baby Got Back.” It’s an undeniable classic, with its perfect balance of cheesiness and fun. Recently, Sir Mix-A-Lot and purveyor of big butts surprised the crowd at Benaroya Hall in Seattle, and performed “Baby Got Back” with the help of contemporary composer Gabriel Prokofiev and his orchestra.

There is definitely a certain je ne sais quoi seeing a group of middle-aged women dressed to the nines really, really into twerking to “Baby Got Back.” Watch the recording of it go down above.