The Bee Gees/YMMV

Angst Dissonance: Their songwriting in the early 1970s skewed heavily toward depressing, melancholy ballads. The record buying public, both in the UK and the US, became quickly tired of it and stopped buying their albums. It wasn't until they re-emerged as a dance-pop band that they became successful again.
Covered Up: "Rest Your Love on Me", written by Barry Gibb, was an obscure B-side for the Bee Gees. Conway Twitty covered it and took it to #1 on the country charts.
Deader Than Disco: even after shifting their sound to be contemporary in the 80's, the U.S. still associated them with the Disco Craze, causing their 80's releases to be flops.
Ear Worm: Notably Stayin' Alive, You Should Be Dancing and Jive Talkin'.
Ensemble Darkhorse: Maurice has a large fanbase despite singing far and away the fewest lead vocals of the three brothers.
Germans Love David Hasselhoff: Once disco fell out of fashion, they became personas non gratis in the United States, even though they weren't recording disco songs anymore. For instance, their 1987 single "You Win Again" was a number one hit in ten different countries; its US peak was 75.
Just Here for Godzilla: A number of fans try to justify their love of the group by claiming that they only like the pre-disco stuff.
Misattributed Song: Samantha Sang's "Emotion" is often attributed to the Gibbs. They did write it and sing the chorus, though, so it's understandable.
- Andy Gibb's songs also tend to be attributed to the Bee Gees. But like the Samantha Sang example, Barry usually had a hand in the production of them, so it's an understandable mistake. And Andy is the Bee Gees' brother, so it's not surprising he'd sound like them anyway. And then there are the people who don't make a distinction between Andy Gibb and the Bee Gees in the first place.
Memetic Mutation: AH AH AH AH Stayin' ALIIIIVE!
- Which turns out to be very useful for CPR training as well.
Older Than They Think: The Saturday Night Fever period was actually the Bee Gees' second wave of popularity. The first was actually as a Beatlesque rock group in the late 60s, which completely lacked both disco and the falsetto that would become their trademark. Listen to songs like "Massachusetts" and "To Love Somebody"; if all you know are the disco songs, you'll be surprised it's the same band.