He wrote and sang vocals on several of the band's best-known hits, including "(Don't Fear) The Reaper", "Godzilla" and "Burnin' for You".

At the end, both musicians abandoned potential degrees (Roeser's in chemical engineering), and decided to pursue music full-time.

Roeser was enrolled in a communications course, but quit after Soft White Underbelly was formed because he wanted to "stop wasting [his] parents’ tuition money".

The band dropped Braunstein and added new singer Eric Bloom to their lineup, changing their name to Stalk-Forrest Group after a bad gig in 1970.

By Blue Öyster Cult's fifth album Agents of Fortune in 1976, Roeser proved himself as a songwriter and vocalist with the band's signature song "(Don't Fear) The Reaper".

As a result, Roeser's songwriting and vocals were more prevalent on the follow-up albums Spectres, Mirrors, Cultosaurus Erectus and Fire of Unknown Origin.

The video for the former was part of an MTV promo along with Blotto's Metalhead clip, in which Buck made a cameo appearance, as well as playing guitar on the song.

The band's commercial struggles, along with the loss of original members Albert Bouchard (1982) and Allen Lanier (1985), prompted Blue Öyster Cult to break up in mid 1986.

In 1985, Roeser and Bloom participated in Hear 'n Aid, a project created by Ronnie James Dio to raise money for famine relief in Africa.

The record was originally planned to be a concept album, based on Sandy Pearlman's poetry, by former drummer Albert Bouchard.

[10] In 1989, Roeser contributed the instrumental "Gamera is Missing" to the album Guitar's Practicing Musicians Volume 3 (later included on the CD re-release of Flat Out).

After releasing Imaginos, Roeser, Bloom and Lanier continued to tour as Blue Öyster Cult, with various musicians on bass and drums.

Roeser, his wife Sandy, drummer John Miceli and bassist Danny Miranda played the concert under the name "Buck Dharma Band".

Manager Sandy Pearlman came up with the idea of creating eccentric stage names for Blue Öyster Cult's members.