What would you say the main difference between them and those who play in bands.Do session players tend to be lone guns for hire who don't play in one?
Session players are usually much much much better musicians. Also, they have a tendency to be hard to work with. They make a lot of money, but have no time for a life. If they turn up late for recording (no rehearsal time available) then they're sacked, if they hit a duff note, they won't be paid. They really have to be top of their game.
Quote by uvq
yeah fire him secretly... thats what im doing except im firing myself and secretly joining someone elses band

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If you get a virus by looking at porn, is it considered a sexually-transmitted disease?

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thanks for the compliment man!
You have to be a good musician to be a session player, anyone can be in a band.
Patterns In The Ivy present ethnicity on an intriguing and dedicated level. ~Ambient Exotica
A mesmeric melange of yearning voice, delicate piano and carefully chosen samples. ~Lost Voices
My dad's a session guitarist, and I guess you could call him a guitar mercenary. Bands who need a guitarist in the studio hire him. That's about it.

Previous posters are right though, you have to be on your game. My dad practices at least 4-6 hours daily.