I found some sources that state that Khan is ESFP.Sorry man, you cant judge musicians personality type based on the type of music they perform, and the content of their song. as writers do exist, and any personality type can write lyrics that could seem in favour of a type or preference. also, extroverts can be shy and introverts can be social, what matters is how their energy flows :3
Seinfeld: "There are more social skills required to talk one-on-one [than to an audience]. You don't have to be socially fluid to talk to two thousand people." (taken from CelebrityTypes)
How to Fail at Typing Musicians | CelebrityTypes
hope this helps!