in a music shop
I find this website useful. It's written for piano, but I use it for my flute so it might work with trumpet. Just scroll down until you see the hyrule field music. http://herbalcell.com/blog/free-sheet-music/legend-of-zelda-twilight-princess Hope this helped :D
at home
Maybe at a music store.
Nowhere.
BoyDoILoveNarnia.com
You cant
Do a web search for The Simpsons Theme Trombone& you'll find sheet music & instructional videos.
try horntabs.net.......or you can go on youtube look for zoot69 and she will have the music on there for you
you can find labeled and unlabeled Zelda sheet music for piano at herbalcell.com if that does not work try this adress-> http://www.herbalcell.com/free-sheet-music/zelda-link-to-the-past
somewhere
herbalcell.com. if you are just learning, the letters are optional :)
I get most of my sheet music from http://ichigos.com/ But i play flute so I'm not sure if they have a lot of cello sheet music if your interested in Zelda sheet music there is a whole bunch on that website :3