Pot USA? Wow, I've not thought of them in years. They were a talented band that sort of painted themselves in a corner with a couple hits that I'm sure they're forever remembered for. If I'm not mistaken, they've put out a bunch of music over the years, right? Is it good? I remember the song Lump and Weird Al's parody Gump. -You know you've made it when Weird Al covers one of your songs. Enjoy the show, hope it's a good one.
They're pretty locked into a sound, which I happen to really like. I think part of what limits them is their use of what they call the "basitar" and "guitbass" which is explained on their Wikipedia page: Guitars modified in this way use heavy-gauge strings for a heavier sound and are normally tuned in Drop D, though the Presidents play half a step lower in C#. For a basitar, the strings are placed in the D and G positions. Chris uses a .60 gauge string tuned to C# and a .36 tuned to G#. On a guitbass, the strings are placed in the A, D, and G positions. .54 gauge tuned to C#, .42 to G#, and a .32 gauge tuned to C#. In a way I like that they have kind of a singular, self-cohesive vision of rock music. On Freaked Out and Small they do play around with their sound a bit, for example in Tiger Bomb (live version). They also play with normal bass and guitars on that album.Ballew and Dederer/McKeag play a basitar and guitbass, which are regular, six-string guitars with special modifications: Ballew's instrument has two bass strings (with which he plays bass parts), and Dederer/McKeag's instrument has three guitar strings (used to play guitar parts). The original idea came from Morphine frontman Mark Sandman, with whom Ballew had previously worked.