It's incredibly peaceful and calming to sit inside the meditation hall of any wat during the time of the evening chanting. It has always been a priority for us when we visit Luang Prabang to choose different wats to visit around 6:00 p.m when the evening chanting begins. But beware, the chanting can begin much earlier and later, it really seems to vary from wat to wat.
One of my goals now is to try to get video of monks chanting at all sorts of wats, in Luang Prabang, Vientiane, and in smaller towns if they have a wat and we're there in the early evening. It would be fun to compare...and enjoy.