https://www.youtube.com/watch?v=t3Cb1qwCUvI
For some musical jobs having perfect pitch can really make a difference. For example singers, musicians playing bowed stringed instruments or a trombone benefit from perfect pitch. Also, conductors frequently have perfect pitch, probably because a strong musical memory and being able to sight sing on pitch from a score are valuable and depend to a certain extent on perfect pitch. See here for a lot more.
https://en.wikipedia.org/wiki/Music-related_memory
Perfect pitch is also apparently more common in people who speak tonal languages like Mandarin.