Groove for Saint Ambrose
This is a “cross-over” pattern. Cross-over patterns are a type of enharmonic polymeter, where 2 rhythms with different numbers of beats/measure are played at the same tempo: the measures do not line up each time. These rhythms have measures that start at the same point, but do not end at the same point until cycling through a certain number of measures.
In this example, a 3/16 pattern is played against a 4/4 (let’s call it 4/8 - 8 beats/measure with 4 pulses); when 4/8 is played against 3/16, the patterns don’t meet on the “1” until after the completion of 24 beats each at which time they both “cross-over”, meeting on the “1”: 3 bars of the 4/8 rhythm (3 bars X 8 beats/bar = 24 beats) and 2 bars of the 3/16 (2 bars X12 beats/bar = 24 beats).
The take home point is that this pattern could be counted in “4” or counted in “6”, depending upon how you listen to it. So this adaptable pattern could be used for 2 different songs, in 2 different meters, equally effectively: this pattern then, in a sense, has learned that “when in Rome, do as the Romans do”.