You can download sheet music for The Little Drummer Boy at the Holiday Sheet Music site http://download-sheet-music-online.com/holiday.html
You can download sheet music for Have Yourself a Merry Little Christmas at the Holiday Sheet Music site at the related link below. (see also the related question)
http://img24.imageshack.us/img24/6923/littledorrit.jpg This is the link to the music sheet that someone transcribed. It's for free and is the only sheet music that you can find at the moment for the Little Dorrit theme song. The composer of the music from Little Dorrit is John Lunn and i don't know if he will ever publish the sheet music for Little Dorrit, so this is probably the closest that we can get for the time being. :)
Have Yourself a Merry Little Christmas was written by Ralph Blaine and and Hugh Martin source: Digital Sheet Music at http://download-sheet-music-online.com/ Have Yourself a Merry Little Christmas was written by Ralph Blaine and and Hugh Martin source: Digital Sheet Music at http://download-sheet-music-online.com/
You get sheet music for Without You and you play it.
greatscores.com has it for $4.99
Try a google images search. Sheet music for the part should show up.
Yes. Reading sheet music is not a pre-requisite for singing, by any means. In fact, I sing, and play several instruments, and I read sheet music very little.
It costs a little bit more for paper sheet music, because of the production costs associated with making it.
nowhere
To find piano notes, you must find sheet music for the song. Check your local library or music store to see if they carry books filled with sheet music.
Sheet music can be viewed online at several different places. Some of these places include Online Sheet Music, Sheet Music Plus, and Sheet Music Direct.