Good song's to improve bass skills?

I've been playing bass for about 1 and a half months. I would say i pretty good for the time I've been playing. I'm good at playing normal basslines like All-Star, and some RHCP songs. Im also quite good at freet control and all that since i played guitar before. But now I'm looking for a good song to practice to, like speed, shifting and whatever there is.

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Thanks in advance!