Most forms of traditional Chinese singing, Beijing opera and the like, are easier for Westerners to "admire" than to "enjoy." When I learned that I'd be spending a couple of hours hearing songs from a 2000-year-old tradition, I was preparing myself for a bout of "admiration." In fact, it was tremendously enjoyable, and I was sorry only that the program (flyer to the left) had to come to an end.
The lore of Lao Qiang is that these are songs from old-time rivermen, which have been passed down through the eons by a select few families. Heirs of those families are the current stars of the performing troupe -- notably the Wang family, whose head is the older performer in the first photo below, and the Zhang family, whose Zhang Ximin is the riveting, hard-to-take-your-eyes-off lead singer and string player -- the dark haired man in the second photo. According to the program, these performers spend their days as regular farmers, and practice and perform at night. Who knows about that; but as performers they're great.
If the music has a Western equivalent, I would say it is something like "Muleskinner blues." Lusty, rhythmic, loud, fun. More on the topic here, here, and here in English, here, here, and here in Chinese. Of course the brief clips don't really do it justice. See it yourself.