I think you read this the same way I did... he's talking about low frequency material in music, not actually musical material for the bass guitar.
As for low freq, just search around for things like bass technik or similar. They make songs specifically heavy on sub-bass frequencies.
BTW, my system for basement parties back in college consists of a dual 18" sub powered with 1800W amp and two horn-loaded 15" mains with 350W each. Shakes the house. And, if you're looking to power some speakers, I have some REAL amps, none of that home stereo receiver crap, these things will put out a true 1000W or power (or more), though they weigh like >20lbs each (one Crown amp I have weighs ~50lbs!).