 Tips
Usually in USA it's about 18% on average.. 15-20% nationwide depending on the resturant and the waitress.. Mainly the waitress..lol.
Ohh Tips on playing.. oops,, never mind my last remark!
Ok, I see you like Jaco. Try listening to Eddie Gomez and Scott Lafaro on the Bill Evans Records. Gary Peacock and Chuck Israels sound good too but the tech stuff is another lever with Scott and Eddie.
Also, drop the Slab and learn this on the Double Bass first. You can always repeat what you've learned on the Slab and add a few things after you drop the convienient Jaco licks and think only of the music. Paul W., here on TB had worked with Bill Evans and can also guide you on Jazz soloing. | 
