Starting next month, Jimmy Kimmel Live! will debut “Mash Up Mondays,” a new musical performance series that will pair two very different artists as a one-time-only supergroup. “Wee-Z Top” will kick off the series on Monday 2/2 — if you didn’t guess already, that’s a combination of “Weezer” and “ZZ Top.” 2/9 brings “Morris Day [...]