Stevie Nicks and Lindsey Buckingham seem to be teasing a project after posting coordinated Instagram updates with the lyrics to "Frozen Love." Days later, a billboard with their portrait popped up in Los Angeles with the date Sept.

Nicks, 77, and Buckingham, 75, took to their Instagram accounts on Thursday, July 17, to share lyrics from “Frozen Love,” the 1973 song they released as the rock duo Buckingham Nicks before Mick Fleetwood heard it and invited them to join his band.

Fleetwood Mac’s Stevie Nicks and Lindsey Buckingham appeared to tease a potential reunion with cryptic Instagram posts. On Thursday, Nicks, 77, shared an Instagram post that read: "And if you go forward…," which may be referring to the lyrics from "Frozen Love," a song the band released in 1973.