I have met many people that terminal. Which 21 people across Thailand have very few foreigners, but most often there is a event organizer, I have seen the live music of professional musicians.
I have found a lot of people at the Terminal, which is extremely rare Thai people in 21 encounters, but most foreigners who work there often, organized event I've seen play live music of a professional musician.
I have found lots of people who Terminal 21, Thai people have found very little but it was the most of the foreign-invested enterprises that have a work event is frequently, and I have seen a professional musicians play live music.