News Gothic is the main typeface used on the artwork for the albums and singles by Swedish pop group ABBA from 1976 to 1982. It is also the typeface used for the iconic logo with the backwards ‘B’ …
[…] designed by Rune Soderqvist, who had designed ABBA’s record sleeves. The logo first appeared on the French compilation album, Golden Double Album, released in May, and would henceforth be used for all official releases.
But the idea for the official logo was made by the German photographer Wolfgang Heilemann on a “Dancing Queen” shoot for the teenage magazine Bravo. On the photo, the ABBA members held a giant initial letter of his/her name. After the pictures were made, Heilemann found out that one of the men held his letter backwards as in ᗅᗺᗷᗅ. They discussed it and the members of ABBA liked it. — Wikipedia
For the albums Ring Ring, Waterloo and ABBA, different fonts were used.