Only a couple of people mentioned Elton John.
No one mentioned RuPaul, America's favorite Drag Queen. Your gay cards have officially been revoked! :P
http://www.youtube.com/watch?v=0a0nIxAfPFU">RuPaul - Devil Made Me Do It
http://www.youtube.com/watch?v=4KxZFyoZsBA">RuPaul - Jealous of My Boogie (Featuring Chi-Chi-LaRue)
http://www.youtube.com/watch?v=N3RB_56WziA">RuPaul - Cover Girl (Featuring Bebe, Nina, and Rebecca)
http://www.youtube.com/watch?v=tyG3MP6FebQ">RuPaul - Looking Good, Feeling Gorgeous
http://www.youtube.com/watch?v=TDqPpbqSnAI">RuPaul and Elton John - Don't Go Breaking My Heart
If you're looking for something a little different, how about Matt Alber? He's clearly such an awesome person, with the heart as big as the world, and it comes out in his music.
http://www.youtube.com/watch?v=bTvJdpkdLiw">Matt Alber - End of the World
http://www.youtube.com/watch?v=q-Vjl46hkIw">Matt Alber - The Slow Club
http://www.youtube.com/watch?v=eLthR4nj1BA">Tightrope
Is Matt Alber a little to mellow for you, but you like the style? How about someone a bit more edgy like Jay Brannan?
http://www.youtube.com/watch?v=lNxzFPTA1y4">Jay Brannan – Housewife
http://www.youtube.com/watch?v=eVuhdIK2E7o">Jay Brannan - Soda Shop
http://www.youtube.com/watch?v=6AV5XzKjz2Y">Jay Brannan - Can’t Have It All
http://www.youtube.com/watch?v=_7CDT820D7c">Jay Brannan – Half-Boyfriend
Both Matt and Jay write their own songs and thats part of their charm, but aren't exactly mainstream. If you're looking for mainstream - and I can't believe no one mentioned her - how about some LadyGaga? She's openly bisexual, extremely pro-LGBT, and in her music videos she shows she isn't afraid to highlight that she's a bisexual. After all, her famous song Poker Face is about her having sex with a guy while imagining she's with a woman instead.
http://www.youtube.com/watch?v=_de3C3Pkb8Q">Lady Gaga - Poker Face
http://www.youtube.com/watch?v=1mB0tP1I-14">Lady Gaga - Love Game
http://www.youtube.com/watch?v=qrO4YZeyl0I">Lady Gaga - Bad Romance
http://www.youtube.com/watch?v=GQ95z6ywcBY">Lady Gaga - Telephone (Official Explicit Version featuring Beyonce)
I have a soft spot in my heart for artists that market directly to the LGBT community, especially independent artists! Hopefully some of you guys enjoy Jay and Matt, and for shame that no one mentioned RuPaul. :P