Answer:

ABBA

Answer	Crossword Clue
ABBA	"Dancing Queen" band
ABBA	"Fernando" band
ABBA	"S.O.S." singers

ABBA	"Take a Chance on Me" singers
ABBA	Swedish rock group
ABBA	Swedish rockers
ABBA	"Dancing Queen" singers
ABBA	"Fernando" singers
ABBA	"Money, Money, Money" band
ABBA	"Waterloo" foursome
ABBA	"Waterloo" singers

ABBA	Palindromic pop group
ABBA	"Mamma Mia" inspiration
ABBA	"SOS" group
ABBA	"Waterloo" group
ABBA	"Waterloo" band
ABBA	Palindromic band
ABBA	Mr. Eban
ABBA	Swedish pop group

ABBA	Acronymic Swedish band
ABBA	Palindromic pop band
ABBA	Four musical Swedes
ABBA	Palindrome in pop
ABBA	Diplomat Eban
ABBA	"Mamma Mia!" inspiration
ABBA	"Mamma Mia" quartet
ABBA	"Mamma Mia!" band

ABBA	Quatrain pattern
ABBA	Rhyme scheme of "In Memoriam"
ABBA	Title for a Coptic bishop
ABBA	"Enclosed rhyme" scheme
ABBA	Coptic cleric's title
ABBA	"Knowing Me, Knowing You" band
ABBA	Coptic bishop's title
ABBA	Rhyme scheme of Tennyson's "In Memoriam"

ABBA	"Voice of Israel" author Eban
ABBA	"Enclosed" rhyme scheme
ABBA	"Mamma Mia" group
ABBA	"Mamma Mia" pop group
ABBA	Eban of Israel