Is There Anybody Out There? The Wall Live 1980–81, Gilmour's solo was followed by another guitar solo (played by Snowy White in 1980 and Andy Roberts in 1981) and finally an organ solo by Richard Wright. The song was differently arranged on both tours after the departure of Roger Waters. On all shows of the Gilmour-led Floyd, Gilmour sang the lead vocals in unison with Guy Pratt, the children's vocals were augmented by live singing from the female backing vocalists, and the song incorporated a second guitar solo (by Tim Renwick) but no keyboard solo. Aside from this, the overall arrangements in 1987–1989 and 1994 were different. On the A Momentary Lapse of Reason tour, the two guitar solos were adjoined by a short piece of jamming. The song now started with an intro similar to the single version but with a 'teaser break' before the start of the vocals, and ended with a fadeout drowned out by children's voices (not dissimilar to the album version). This arrangement can be heard on Delicate Sound of Thunder. The 1994 tour, instead, saw a different and longer version that combines elements of all the songs's three parts. On Pulse, the song opens with the phone signal (which originally bridged Part 2 with "Mother"), then a helicopter is heard (from "The Happiest Days of Our Lives"), before the band starts playing a short instrumental excerpt of Part 1. The bombastic ending of "The Happiest Days of Our Lives" leads into Part 2 (as on the album), and the ending incorporates the keyboard arpeggio of Part 3, the return of helicopter noises before the song comes to a full stop (as opposed to a fade-out). On the version from the video, the final minute also includes a sample of the vocal echo of "Dogs". From 1988 onwards, Pink Floyd utilized additional sampled parts of the kids' choir, which were triggered by Jon Carin. Most notably, the space between the second verse and David Gilmour's solo was always filled with the shout "Hey, teacher!". In addition, on 1988 and 1989 shows, Carin also triggered the same sample in a 'stuttering' manner over Guy Pratt's short bass solo bridging Gilmour's and Renwick's solo. On the original releases of Delicate Sound of Thunder and Pulse however, this effect was muted (even though the DVD of Pulse still shows the stage LEDs spelling out "HEY TEACHER" at the