We sailed "Miracle" in November of last year, and Music Boardwalk was NOT the band aboard at that time. As I understand it, there are a number of these Filipino bands aboard various Carnival ships, and they are all represented by the same agent. If the first name of the band is "MUSIC", then you can pretty well bet that they'll be good. (My personal experience is that "Music Boardwalk" is the absolute best of the bunch.) They will dress, and perform as the "Beetles" at the finale of one of the BIG production shows that spotlights the Fab Four, but I'm having a "senior moment" and can't think of the name of the show. You'll know it when you see it however.
Don't miss that show, as it's one of the best on the high seas!