Fernando.
Abba
The song Mamma Mia was included on the album titled Abba, released in April, 1975. That means it was written shortly before that, either late 1974 or early 1975.
Martha and the Muffins
Jingle Bells
The ABBA song favorie was "Great Fun".
ABBA sung the eagle song
The Piper - ABBA song - was created in 1980.
Dream World - ABBA song - was created in 1984.
The Star Spangled Banner
Wango Tango - song - was created in 1980.
That was the song, Jingle Bells. Originally titled "The One Horse Open Sleigh"
ABBA's music is considered pop music.