The jazz guitarist John McLaughlin once published a book of scores for a number songs that he composed for his Mahavishnu Orchestra. There are some very unusual theoretical conundrums that come up when reading these songs, and I'd like to ask about one such issue that appears in his score for the song "On The Way Home To Earth."
For the first part of the song, we are told that guitar, drums, and bass vamp for 2 1/2 minutes with a quaver BPM = 304.
Then comes the second part. While the first part continues, an orchestra appears by voicing a number of whole note chords in the quaver BPM = 138.
Strange mix, no? Well, on the bottom of the score we find a curious note:
NOTE: The tempos are not related, for when correctly played, one will notice the creation of tension and its release as the slow tempo gradually envelops the fast.
Can someone explain this harmony/entropy of tempo? Is McLaughlin suggesting that the musicians from the first part will naturally adjust their playing to meet with the orchestra's playing? Or is their some kind of musical force that explains how slow tempos envelope fast tempos when listening to their sonic clash?