which tubes for which genre ?

Waste of money pal especially for rock...
And What's the point havin' amp only for voice or small acoustic bands???
Anyways, one of my favorite tubes are AudioResearch VT100 and I like it with any type of music. It can rock, sing and jazz, just give it the right speaker -- yours are but there's always room for better match...
Also you can research VTLs and Quicksilvers that are more affordable options

Matter of fact: A pair of VTL 300 Monoblocks would be a perfect match for your speakers(if you have the room). Whatever load they are wired for will receive their full rated output. Just be certain they are internally connected for a 4 ohm speaker(easy). WON'T break the bank/WILL rock the house! Very fast slew rate for a tube amp(more detail/accuracy, better imaging, great soundstage) and excellent bottom end.

thanks for the advice guys, let me start from the beginning do the audience 42's match better with ss or tubes ?

For rock, I would recommend KT88's in push pull.

This will give an easy 30+ watts clean.

KT88's give a very linear uncolored sound.

John C.

I agree that a higher powered push pull amp like vtl,manley
audio research,quicksilver and cary would be my choice for this speaker;but if you can $$ a atmasphere ma1 or ma2 I would look at those as well.
If you able to audition amps in your area I would listen to all that you can; how big your room is will be a important factor as well.