This is an excellent 2-CD set full of obscure tracks, many never before released. It includes things like excepts from interviews and radio shows, live tunes, plus some complete backing tracks - the music as it was recorded before vocals were added. It's fascinating to hear some of the intricate stuff going on that's usually covered by harmonies! There are also some great tracks that young Brian Wilson made by dubbing with multiple tape recorders so he could harmonize with himself (I used to make tapes like that all the time!).