Thank you for the tips, Vu!
I would love to do some more concert photos in the future, learned alot from this one and all of your tips will make the next one better I`m sure
I did feel however that F2,8 didn`t let through enough light though, or is that me not being able to time it right? I had to use very high iso when using my Tamron 28-75 F2.8. to get some decent shutter times or else it just turned out blurry or too dark.