Einstein on the Beach isn’t really the best way to get into Glass if you aren’t into that kind of stuff already. I do recommend checking out the original Einstein on the Beach, but specifically the Knee Play 5. It’s not really the kind of music you’d bob your head to. It’s more akin to the soundscapes you’ll find in ambient or drone music. And the counting doesn’t actually mean anything deep. It was just an on the spot decision, as the singers were practicing the music by counting, and when asked about what the lyrics would be, Glass just chose to have it stay as the counts.