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If this is your first foray into shooting live performances, you've done well. Your exposures are good, so don't worry about ever-changing lighting. Just be mindful of changes to overall light levels. So now what you have to concentrate on are the "moments" and the details. Your first shot is just such a moment, but I'd crop out the arm on the left edge of the frame. Your second shot is a good detail shot. If you're traveling with the band, you'll be able to anticipate these moments and opportunities for details; it'll become easier and easier.
The third and fourth shots, however, don't quite measure up to the first two. The congas are "unmanned" but the frame isn't tight enough to be a detail shot; the drummer is looking away doing not much of interest; and the bass player is just a sliver in the frame. Likewise, in the fourth shot, the guitarist is well lit and the composition could be interesting, but he's not really showing us anything. It's a high note he's hitting, but there's no energy to his stance or his expression. Some guys just don't emote much on stage (think Charlie Watts of the Rolling Stones). But if you focus on their faces, very tightly, you'll always be able to catch a "moment", even if it's only fleeting.
Keep at it!