We are alternating between songs of around 135 BPM (easy recovery pace for me) and 160 BPM (definitely not recovery pace! Rather speed run pace). This is for me switching between 4 and 9 (out of 10) effort. It might be different for you, and you can decide on effort putting into this kind of leg-turn-over.
One warm-up walk (1 songs), pre-run dynamic stretches (1 song), a main interval session (6 songs), cool-down walk (1 song) and a post-run stretch (2 songs). For ideas for post-run stretches, head to https://healthunlocked.com/strengthandflex/posts/151682614/a-post-run-stretch-routine .
(Songs by The Mamas & The Papas, Steely Dan, Electric Light Orchestra, Delta Rae, The Cars, Pharrell Williams, Mel Tormmé, The Chainsmokers & Daya, Remember Monday, The Beach Boys and Grace Jones)