Ok - this lot will date me I am afraid
Boromir (because he IS the disco king) "I love to Boogie" T-Rex
Bombadil "All around my Hat" Steel-eye Span
Sam & Gaffer "Father and Son" Cat Stevens ( NOT Westlife - puhleaze)
Merry and Pippin - either Supergrass "Alright" or Rolfie's "2 little boys"......
Aragorn and Arwen "Through the Barricades" Spandau Ballet
Legolas - Carly Simon "You're so vain"
Gandalf - for some reason it has to be C&W so "The Gambler" Kenny Rogers
Treebeard "I want to be a tree"
Elves (as depicted in the films) "Singing meaningless songs in very high voices" The Heebeegeebees
http://www.mikefs.co.uk/HBGB.html
Frodo "Why does it always rain on me?" Travis
Eowyn "Everybody Hurts" REM /" Flowers in the Window "Travis /"Waterloo" Abba
Eomer "Wild Boys" Duran Duran
Beren "The first time ever I saw your face"
Elrond "One Tree Hill" U2
Denethor "Light my Fire"
Gimli "Thank You for the days" Kirsty McColl
Elves "Go West"
Grima "I'll be watching you" Police