If you clear copyrighted materials for a living then you may wish to read this Ninth Circuit case that applies the fair use test to various bits and pieces relating to Elvis (such as his appearance on the Ed Sullivan Show) that were used in a documentary. Interesting dissent.
Elvis Presley Enterprises, et. al. v. Passport Video, No. 02-57011 (9th Cir. Nov. 6, 2003).