Question: Brian Kay played a voice in which Paul McCartney and the Frog Chorus song?

full_context: Document 1: Rupert and the Frog Song: Rupert and the Frog Song is a 1984 animated film based on the comic strip character Rupert Bear, written and produced by Paul McCartney and directed by Geoff Dunbar. The making of "Rupert and the Frog Song" began in 1981 and ended in 1983. The film was released theatrically as an accompaniment to McCartney's feature film "Give My Regards to Broad Street". The song "We All Stand Together" from the film's soundtrack reached No. 3 when released in the UK Singles Chart. It was released in 2004 as one of the segments of "".
Document 2: Kermit Unpigged: Kermit Unpigged is a music and comedy record released by The Jim Henson Company through BMG Kidz in 1994, and the last album released by Jim Henson Records. The record’s title is a clear parody of the MTV series “MTV Unplugged”, and the cover is a parody of Eric Clapton's "Unplugged" album cover as well. The album consisted of Kermit and the other Muppets getting lost at a recording studio and encountering celebrities including Linda Ronstadt, with whom Kermit sang “All I Have to Do is Dream”, Vince Gill who sang “Daydream” with Kermit, Jimmy Buffett who sang “Mr. Spaceman” with Gonzo, and Ozzy Osbourne with whom Miss Piggy sang “Born to be Wild.” The album ends with all The Muppets meeting back up and singing the Beatles song “All Together Now.”
Document 3: John Kay (musician): John Kay (born Joachim Fritz Krauledat, 12 April 1944, Tilsit, East Prussia, Germany, now Sovetsk, Kaliningrad Oblast, Russia) is a German-Canadian rock singer, songwriter, and guitarist known as the frontman of Steppenwolf.
Document 4: Stand!: Stand! is a 1969 album by soul/funk band Sly and the Family Stone. Written and produced by lead singer and multi-instrumentalist Sly Stone, "Stand!" is considered an artistic high-point of the band's career. Released on May 3 by Epic Records, just before the group's celebrated performance at the Woodstock festival, it was the band's fourth album, and most commercially successful to date. It includes several well-known songs, among them hit singles, such as "Sing a Simple Song", "I Want to Take You Higher", "Stand!", and "Everyday People". It was published in US as an LP record with gatefold cover, and was reissued in 1990 on vinyl and CD and in 2007 as a remastered numbered edition digipack CD with bonus tracks and, in the UK, only as a CD with bonus tracks.
Document 5: The Frog and the Nightingale: The Frog and the Nightingale is a poem composed by Indian poet Vikram Seth in 1994.This poem is an allegory(a poem in which a moral is conveyed) The poem tells a story about a frog and a nightingale. The poem was originally published by Evergreen Publications, but it was later used by the Ministry of Education, India as a poem for school students.
Document 6: Piggies: "Piggies" is a song by the English rock group the Beatles from their 1968 album "The Beatles" (also known as "the White Album"). Written by George Harrison as a social commentary, the song serves as an Orwellian satire on greed and consumerism. Among several elements it incorporates from classical music, the track features harpsichord and orchestral strings in the baroque pop style, which are contrasted by Harrison's acerbic lyrics and the sound of grunting pigs. Although credited to George Martin, the recording was largely produced by Chris Thomas, who also contributed the harpsichord part.
Document 7: We All Stand Together: "We All Stand Together" (sometimes referred to as the Frog Song or the Frog Chorus) is a song by Paul McCartney and the Frog Chorus.
Document 8: Roger Vignoles: Roger Vignoles, born 12 July 1945, is a British pianist and accompanist. He regularly performs with the world's leading singers, including Kiri Te Kanawa, Thomas Allen, Anne Sofie von Otter, Thomas Hampson, Gitta-Maria Sjöberg, Sarah Walker, Sylvia McNair, Susan Graham, Christine Brewer, Felicity Lott, Stephan Genz, Monica Groop, Wolfgang Holzmair, Bernarda Fink, Christine Schäfer, Brigitte Fassbaender and Kathleen Battle. He also accompanies instrumentalists such as Joshua Bell, Heinrich Schiff, Nobuko Imai and Ralph Kirshbaum, and gives masterclasses around the world.
Document 9: Paul McCartney: Music &amp; Animation: Paul McCartney: Music & Animation is an animated anthology film compiling three animated short films produced by Paul McCartney. It was released by Miramax Films on DVD. The film includes "Rupert & the Frog Song", "Tuesday" and "Tropic Island Hum". Paul McCartney wrote or composed music for each short.
Document 10: Owen Brannigan: Owen Brannigan OBE (10 March 19089 May 1973) was an English bass, known in opera for buffo roles and in concert for a wide range of solo parts in music ranging from Henry Purcell to Michael Tippett. He is best remembered for his roles in Mozart and Britten operas and for his recordings of roles in Britten, Offenbach and Gilbert and Sullivan operas, as well as recordings of English folk songs.
Document 11: Philip Kay: Philip Kay is a contemporary composer and producer. He is also a founding member of the band Working For A Nuclear Free City.
Document 12: United We Stand (song): "United We Stand" is a song written by Tony Hiller and Peter Simons (aka group member Johnny Goodison). It was first released in 1970 by The Brotherhood of Man (in their original, pre-Eurovision line-up), becoming the band's first hit, peaking at #13 in the U.S., #9 in Canada, and #10 in the U.K. The song spent 15 weeks on the charts, and is ranked as the 64th biggest U.S. hit of 1970. It also reached No.8 in Australia.
Document 13: Peter Kay: Peter John Kay Hon. D.A. (born 2 July 1973) is an English comedian and actor. His 2010-11 stand-up comedy tour was officially inaugurated into the "Guinness World Records" as the most successful of all time, playing to over 1.2 million people. In a 2004 poll for the BBC, Kay was named the 46th most influential person in British culture.
Document 14: Brian Connolly: Brian Francis Connolly (5 October 1945 – 9 February 1997) was a Scottish musician and actor, best known as the lead singer of the British glam rock band The Sweet.
Document 15: Brian Kay: Brian Christopher Kay (born 12 May 1944) is an English radio presenter, conductor and singer. He is well known as the bass in the King's Singers during the group's formative years from 1968 until 1982, and as such is to be heard on many of their 1970s LP recordings. He was also the voice of Papageno in the film "Amadeus" and the lowest frog in the Paul McCartney song "We All Stand Together" (The Frog's Chorus).
ground_truth: We All Stand Together