The Amsterdam-based rock/rap collective Urban Dance Squad began in 1986, playing and jamming together on an informal basis. They played a gig at the Utrecht Festival and, surprised by the raves their performance drew, became a more serious project. The group gigged for two years, and with the proceeds released 1990's Mental Floss for the Globe. Urban Dance Squad's mix of rock, rap, funk, ska, folk, hip-hop, and soul signaled the trend toward genre-bending that prevailed in '90s music. Mental Floss featured the single "Deeper Shade of Soul" which charted at number 21 in the U.S. on Billboard's Hot 100.