"Clash of the Titans: Mariah Carey vs Whitney Houston," cover night
I HAD A VISION OF THE GREATEST LOVE OF ALL | It hardly seems fair to compare any singer to the late Whitney freakin’ Houston, but if anyone has pipes to rival Whitney’s, it’s Mariah “Whistle Register” Carey. This week’s CLASH OF THE TITANS: MARIAH CAREY V. WHITNEY HOUSTON pits two of the bestselling pop divas of all time against each other; we can only hope to hear a rendition of “When You Believe,” their award-winning duet from 1998. 10pm. $6. At Empire, 575 Congress St., portlandempire.com.