recording "How Deep Is Your Love," but, according to Barry, their manager Robert Stigwood said, "You've got to do this song yourself, you should not give it to anybody". Release and critical reception "How Deep Is Your Love" was released as a single in September 1977 everywhere except in the UK, where it was released on 29 December 1977. By the time Children of the World was recorded, it was pretty much established that Barry was now the primary vocalist of the group, mostly being falsetto leads with the occasional natural breathy voice. Even most of the backing vocals were done by Barry, such that Robin and Maurice are barely heard in the mix, even though they are there. Despite this, Robin sings the melody for the chorus and audibly sings various ad libs during this song. Two music videos were made for this song, with minimum lights. In one (the precursor to the main music video released later), the brothers are shown singing while a shady image of a woman shows throughout the video, accompanied by a big white light shining around. Barry Gibb had his beard shaven off in this video, the same as in the "Night Fever" video. A second video (the main one) was later made in which features the brothers sing while passing by a stream of rainbow lights. In this video Barry Gibb is bearded. On the Cashbox charts on the week 4 February 1978, when it was at No. 13, the soundtrack's second single "Stayin' Alive" was at No. 1 with "Night Fever" debuted at No. 71 on the same week. When "How Deep Is Your Love" became a UK #3, Barry exclaimed: "You have no idea what a thrill it is to have a Top Five single in England. With all the new wave and punk rock out, I would have thought something like 'How Deep Is Your Love' wouldn't have a chance. We always kept going forward and we're getting stronger every day". Billboard described the song as "a warm tender ballad," saying that after a slow beginning it grows to a "heightened expressive delivery." Cash Box said that it's "a beautifully harmonized, melodic ballad for music lovers of all ages." Record World said that it is "one of their most controlled, delicate efforts, with the vocals almost whispered at times" and that it has "a good melody and expressive love