Only 2 members of ZZ Top have big beards. The drummer, ironically named "Frank Beard", doesn't have one. The question makes it sound like they all have beards.
I've never heard that Kesha song, but she was my first guess because that's precisely the kind of pandering, image-conscious lyric that defines all her songs.
...and because "Amy Winehouse" is not five letters.
It's very confusing, I know...
...and because "Amy Winehouse" is not five letters.