When it comes to many YouTube live concert videos, the sound quality is often pretty bad. The bass drowns out the rest of the instruments, and the sound is often too loud for the video camera to pick up without distortion.
Sometimes, though, you can use this distortion to your, the viewer’s, advantage: if the distortion actually emphasizes one instrument, like the guitar, over the others, you can better hear background guitar parts that you’ve never heard before, even on the album.
Here’s a great example of this: the bass drowns out the vocals in the live concert video of “I See Red” by Uh Huh Her below. But, you can consequently hear the guitar part above all other instruments.