"How Deep Is Your Love" is a song by Scottish DJ and record producer Calvin Harris in collaboration with the British production trio Disciples. It was released on July 17, 2015. The track features uncredited vocals by Norwegian singer and songwriter Ina Wroldsen. It is a deep house song written in the key of E minor, with a tempo of 122 beats per minute. The song has a hypnotic, upbeat vibe with bassy plucks and piano chords, and is influenced by 90s Euro house music. The lyrics reflect a longing for deep, intimate love and connection, with repeated questions about how profound and enduring this love is, using metaphors like the ocean and nirvana. The song explores themes of closeness, devotion, identity through love, and sexual freedom with no inhibitions or fear. "How Deep Is Your Love" achieved commercial success, reaching the top ten in 22 countries and number one in Australia, Belgium, Greece, the Netherlands, and Russia. It was well-received by critics and is a notable summer dance track from Calvin Harris' music career.