Hol Rock was a going to be a breakthrough for music according to Holly. It involved decimalising the musical scale. Instead of the octave, it was now the decatave. He also noted that there were two new notes, H and J. He added "wo" and "bo" to the solfeggio scale: "Do Re Mi Fa So La Wo Bo Ti Do."

Holly also confidently predicted that, due to this enlargement of musical scales, triangles would have four sides and pianos would be the length of a zebra crossing. However, one downside was that women would have to be banned from playing the cello, unless they did it side saddle or used birthing stirrups.

Rimmer and Lister believed Holly was simply bored.


  • Hol Rock was mentioned in the Series II episode "Kryten".

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