Listen to J.S. Bach: Variations Goldberg BWV 988: Variation 30 Quodlibet online. J.S. Bach: Variations Goldberg BWV 988: Variation 30 Quodlibet is an Unknown language song and is sung by Claudio Arrau. J.S. Bach: Variations Goldberg BWV 988: Variation 30 Quodlibet, from the album Bach: Music for Focus, was released in the year 2021. The duration of the song is 1:40. Download Unknown songs online from JioSaavn.