most clear, crisp sound power amps, monoblocks ?

Lots of live stuff is not crisp.
Rock Concerts are not live, they are electronic.

This is your first post and this is what you come up with.

a very vague question that encompasses thousands of possible answers. Not to mention you left out about a dozen important qualifiers that anyone with any knowledge of audio would need to make a credible recommendation!

Try again Amigo!

Hey, can we be a little nicer, AG members? Everyone doesn't necessarily have the same background or speak in the same lingo, but that's not a reason to be snarky.

Narcisco, To answer your question politely, everyone will have a different idea of what live music sounds like to them. Therefore, you must try out different types so that you find what sounds live to you. That said, there are many brands that are reputable and of good value, but this is also a hobby in which you can be ripped off if you are new to it. If something sounds good to you and you can afford it, that's the key.

Once you try an OTL amp there's no going back, tubes actually connected directly to the speakers. The cleanest sound I've ever heard! One thing to be aware of with an OTL amp you MUST be aware of the impedance of the speakers and match them accordingly. This is more important than other amp/speaker matching IMO.... not to say this doesn't make a difference with other amps and matching to the correct impedance, it's just more critical with an OTL design.

(Dealer disclaimer)

I think it is a very clear and direct question, "What is best". I recall a famous quote in answering that question, " TO CRUSH YOUR ENEMIES, SEE THEM DRIVEN BEFORE YOU AND TO HEAR THE LAMENTATION OF THIER WOMEN". I think that was either Conan the Barbarian or Michael Fremer. I forget which.