Sean O'Hagan (born 1959) is an Irish singer and songwriter who leads the avant-pop band the High Llamas, which he founded in 1992.

The High Llamas were influenced by the Beach Boys, Ennio Morricone, Antonio Carlos Jobim and avant-garde electronica.

[5] Some of the songs that later appeared on the High Llamas' 1998 album Cold and Bouncy were then briefly under consideration to be recorded by the Beach Boys.

I'm happy enough to have been influenced by [him] [...] He's not mad, but [...] I asked him what sort of record he wanted to make and told him he could have strings and brass, and I was witness to him running around his house shouting "Too much!"

[9]A post attributed to Wilson on his website wrote that O'Hagan was "a real sweet guy, but I didn't think I needed him to show me how to do the things I had already done 30 years earlier".