Twentieth Century Music Company is on Main Street. The Cigar Store Indian is right out in front of it. My copy of
The Disneyland Encyclopedia says that it is "jam packed" with "Disney-related music", "including all the soundtracks from Disney films and Disneyland attractions a fan could want". They apparently even have kiosks where you can put old-school Disney vinyl albums onto CD's with the original LP artwork. Pretty sweet!