What other bands have notable anniversaries this year?

[Macfan4life]

Interesting looking back. Rumours was released February 4, 1977. The first single was released in December 1976. Its fun to remember back in the days of no internet or other ways of knowing a group's new album (other than the radio) how far apart the single and album were. Today isn't the album released almost the same day. The norm was usually around 2 weeks in the 1980's.
I guess there was no reason to rush the album until the public was well aware there was new music and there was a hit from the album.