Hint #1: Artists sometimes collaborate
Hint #2: In the unlikely event that the artists in the four long entries collaborate, we might get mash-ups like "Hot Stuff Everyday," "I Have Nothing No One," "Sweet but Psycho Chain of Fools," and "Bad Blood Vampire"
Hint #3: Encore! Encore! Don't you just love these pop divas so much you want to hear them again?
Hint #4: Summer Grande = take the D from Donna Summer (who sang "Hot Stuff") and the A from Ariana Grande (who sang "Everyday")... repeat the two letters = DADA
Hint #5: You'll end up with a 4-letter repeated bigram when you extract the first letter from the relevant clues but this doesn't fit the 7-letter answer criterion... the 4-letter name you found is an alternative answer for the clue at 59-Down