Barcelona
... that the song "Barcelona" by Freddie Mercury and Montserrat Caballé is considered an illustrative example of the difference between pop and classical singing?
... that the song "<b id="mwEbY"><a href="./Barcelona_(Freddie_Mercury_and_Montserrat_Caballé_song)" id="mwEbc" rel="mw:WikiLink" title="Barcelona (Freddie Mercury and Montserrat Caballé song)">Barcelona</a></b>" by <a href="./Freddie_Mercury" id="mwEbg" rel="mw:WikiLink" title="Freddie Mercury">Freddie Mercury</a> and <a href="./Montserrat_Caballé" id="mwEbk" rel="mw:WikiLink" title="Montserrat Caballé">Montserrat Caballé</a> is considered an illustrative example of the difference between <a href="./Pop_music" id="mwEbo" rel="mw:WikiLink" title="Pop music">pop</a> and <a href="./Classical_music" id="mwEbs" rel="mw:WikiLink" title="Classical music">classical</a> singing?