I just purchased ($10) the 1968 cast recording of the Broadway musical Hair. I couldn’t find the album in Apple Music so I had to purchase from the iTunes store. The album charted No. 1 on the Billboard 200, the last Broadway musical cast album to do so (as of 2016, which finally saw The Hamilton Mixtape chart No. 1, although that is not a cast album). So says Wikipedia. Hair’s cast album stayed at No. 1 for 13 weeks in 1969. You had to be there.