Operatic pop representative of the subgenre. In the 2000s, singers and singing groups devoted primarily to operatic pop built on this renewed success. Groups like Il Divo and Amici Forever have achieved popularity with the mix of "contemporary pop with operatic style" characteristic of operatic pop. The subgenre is often performed by classical crossover singers and acts, although that field is much broader in the types of music it encompasses. "Popera" performances, such as those by the Three Tenors, have reached larger audiences and brought in greater profits than typical for operatic music. Notable operatic pop solo singers include: Notable operatic pop
Avant-pop inspiration from free jazz, German academic music, and Anglo-American pop-rock. According to "The Quietus" David McNamee, the 1968 album "An Electric Storm", recorded by the electronic music group White Noise (featuring members from the U.K.’s BBC Radiophonic Workshop), is an "undisputed masterpiece of early avant-pop". In the 1970s, progressive rock and post-punk music would see new avant-pop fusions, including the work of Pink Floyd, Genesis, Henry Cow, This Heat, and the Pop Group. More contemporary avant-pop artists have included David Sylvian, Scott Walker, and Björk, whose vocal experimentation and innovative modes of expression have seen them move beyond norms of