Original beats that feature funk-styled bass or rhythm guitar riffs are also not uncommon. Dr. Dre (considered the progenitor of the G-funk genre) has freely acknowledged to being heavily influenced by George Clinton's psychedelia: "Back in the 70s that's all people were doing: getting high, wearing Afros, bell-bottoms and listening to Parliament-Funkadelic. That's why I called my album "The Chronic" and based my music and the concepts like I did: because his shit was a big influence on my music. Very big". Digital Underground was a large contributor to the rebirth of funk in the 1990s by educating their listeners with knowledge about the history of funk and its artists. George Clinton branded Digital Underground as "Sons of the P", as their second full-length release is also titled. DU's first release, Sex Packets, was full of funk samples, with the most widely known "The Humpty Dance" sampling Parliament's "Let's Play House". A very strong funk album of DU's was their 1996 release "Future Rhythm". Much of contemporary club dance music, drum and bass in particular has heavily sampled funk drum breaks.