(Sing if you're) Glad to be Gay is a song by Tom Robinson, released several times since its first release in 1978.
"Glad to be Gay" was originally written for a Pride rally in London in 1976 and reached No.18 in the UK charts as part of TRB's Rising Free EP.
Rising Free/Glad To Be Gay EP (1978)
Album Cabaret '79: Glad To Be Gay (1982)
His last studio album Having It Both Ways (1996) included a short hidden track at the end of the record, sung acapella to the tune of his earlier hit Glad To be Gay
http://www.bolchini.com/mow/tr/lyrics/all.html#gtbgII
http://www.bothways.com/both2003/gtbg.htm
"Good to be gay" precursor