Comment by gnodar

I found a path from Piano to Volcano with 40 generated topics! Piano → Instrument (broader) Instrument → Juilliard School (places) Juilliard School → American conservatories (past) American conservatories → Historic music conservatories (past) Historic music conservatories → Paris Conservatoire (places) Paris Conservatoire → European conservatories (broader) European conservatories → Europe (broader) Europe → Sicily (places) Sicily → Mount Etna (similar) Mount Etna → Volcanoes of Italy (similar).