West's musical career is defined by frequent stylistic shifts and different musical approaches. In the subsequent years since his debut, West has both musically and lyrically taken an increasingly experimental approach to crafting progressive hip hop music while maintaining accessible pop sensibilities. He has introduced new musical elements and unconventional reference points into his sonic palette with each album. Over time, West has explored a variety of music genres encompassing soul, baroque-pop, stadium rock, electro, house-music, indie rock, synth-pop, progressive rock, industrial, punk and gospel. West's approach to record production is consistently rich, nuanced and thought-provoking. His productions are akin to musical compositions, bearing an ornate style with more depth typical of hip hop artists while making use of an ear for hooks. He incorporates live instruments, manipulated vocal samples and dramatic arrangements to supplement his beats. His later musical works increasingly relied on the application of digital audio workstations and computerized synths, bass, and drums.