Anyway… I'm 14 years old and play flute and piano/keyboard. I love the idea of jamming online but I never tried . I'm into jazz and rock. But why are the public servers so empty ? Is there any appointment that I can join?

Try around the following times:

USA - 2:00 PM EDT, 1:00 PM CDT, 11:00 AM PDT
UK - 19:00 BST
Germany, France, Austria, Sweden, Denmark - 20:00 CET

Thanks!