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I don't want to sound like an ass but this is asked a lot, plus you might find what you're looking for much sooner if you search then wait for someone to reply.

Challenging song?

Try Portait of Tracy by Jaco, or Moonlight Sonata by Stu Hamm.

And if you do...see you in 3 years.
-Fender Deluxe Active P-bass (60th anniversary)
-Peavey T-40 (1982)
-Hartke HA-3500
-Aguilar GS 2x12
-GK Backline 2x10
How many threads asking this same question have been posted in the last month? I lost count at 39231...
Fender '51 Precision Bass
Hofner Verythin LTD Edition Guitar in Walnut w/ Bigsby
Engelhardt ES9 Upright Bass
1968 Trayner YBA 1A MK II Amp
w/ 6x10 cabinet

/\ second that man.

get better at learning your theory by making your own songs, you'll slowly develope your ability to play more difficult songs, and by that time, you will have found them yourself.
Quote by Mr. T
"Mr. T defines love as the reluctance to murder. If you're still alive, it's because Mr. T loves you."

...and for fun, I try to do Alkaline Trio songs. Dan's kind of impressive at times on bass. Especially on Jaked on Green Beers and Armageddon, but that's just my personal opinon, not fact, mind you.