i think her perfect song would be around 100 bpm, in the key of E major, with heavily processed vocals, low-pitched drums, electric guitar, loud bass, and a keyboard synth line
https://www.nature.com/articles/srep00120
IOI is the inter-onset interval. Basically, the time that elapses between beats. A 600 ms IOI means that you can fit 10 beats into 6 seconds, or 100 beats into a minute