Original sentence: The term was initially applied to the music of bands such as King Crimson, Genesis, Yes, Pink Floyd and Emerson, Lake and Palmer (ELP), who are widely regarded as prime exponents of the genre - but other notable examples of progressive rock bands include Jethro Tull, Rush, and Gentle Giant
Edited sentence: The term was initially applied to the music of bands such as King Crimson, Genesis, Yes, Pink Floyd and Emerson, Lake and Palmer (ELP), who are widely regarded as prime exponents of the genre - but other notable examples of "classic" progressive rock bands include Jethro Tull, Rush, and Gentle Giant