Personally, I think a musician is someone's who has a deep passion for playing and creating music...I think the difference between a guitarist and a musician is a guitarist will merely play guitar, the licks they've managed to acquire over the years...a musician would try and expand their range through every means possible...
Just my personal take on things...sorry if I didn't manage to explain that too well, hopefully it'll make sense somewhere to someone......
Don't worry too much about me, ignore me long enough and I'll go away.