“How Deep Is Your Love” is the question of the brothers Maurice, Robin and Barry Gibb (better known as the Bee Gees) in this world-famous pop song. They recorded the ballad in 1977 and contributed it to the soundtrack of “Saturday Night Fever”. This dancing movie, starring John Travolta, is a classic in cinematic history and its timeless success also holds true for the soundtrack, which was largely written by the Bee Gees and turned out to be a chart topper. The ballad “How Deep Is Your Love” wa...