Rampancy.net. It's quite possibly the most annoying site ever, since it is always under maintenance. But the sheet music for Halo, Marathon and Oni is of great quality for a variety of instruments.
You might find A Trumpeter's Lullaby on tabcrawler.com
Halo Theme on the trumpet
Sheet music plus
I play alto sax as well, I also transcribe anything Halo and upload it to Rampancy.net (the largest halo sheet music database). If you can't find it there just message me, my account is Jonathan Churchill on the site. well i play trumpet and i cant fin a good sight to go on.
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Music from the game Halo can be listened to on the youtube website. Alternatively there is a soundtrack available from the website itunes including the Halo theme song.
You get the music and practice, then play and look if turns out well!
Rampancy.net has a lot of free sheet music. You have to sign up, but sign up is free.
See Related Links below.
Go on music player type in Beyonce halo lyrics and copy and paste it on Microsoft word Go to music sheets for piano type in Beyonce Halo see what you get. Ps: I haven't tried it yet on my piano good thinking about that.
The Halo Wars Theme Song. LOL
Rain. defidently Rain.
If you already know how to play piano, go to rampancy.net, create a user account, and then you can download sheet music and print it out. Best ones out there are probally Halo: Reach "Lone Wolf" and Halo 3 "One Final Effort"