Tommy
by The Who
A very expansive record and totally deserved its status as a classic, although there's no deniable it definitely came from the 60's, but every song grew on me, which some parts are cheese-y, but it's all packaged and cohesive. It paved the way to a lot of extensive concept albums from bands like Dream Theater and Pink Floyd. How coincidence the album of the day happened to be the album I felt like listening to.