Question: Were John Bush and Annie Haslam both lead singers?

Context articles: Nevada (UK band)
John Bush (Provincial soldier)
Annie Haslam
Tuscany (album)
Renaissance (band)
Annie in Wonderland
Intergalactic Touring Band
Annie Haslam (album)
John Bush (musician)
John DeNicola

Nevada were a British folk/progressive rock band and a spin-off from Renaissance, featuring Annie Haslam on vocals and Mick Dunford on guitar.
 Their Christmas single, "In the Bleak Midwinter", reached the lower edges of the UK singles chart in 1983.
John Bush was an African-Provincial soldier with the Massachusetts militia that fought on the side of Britain during the French and Indian Wars in North America.
 He is known for his carving of powder horns of the time.
 One of his 1756 horns has been part of a travelling exhibition throughout Canada and US.
 The quality of his carving and use of calligraphy has been called "superb".
 Bush's carving style and decorative embellishments were used in for the Lake George School during the French and Indian War.
 Other powder horn carvers adopted Bush's engraving style.
 They are known as the Sekrig-Page carver, the I.W. carver, and the Memento Mori carver.
 Bush is considered a founder of American folk art.
 He was captured during the battle and fall of Fort William Henry August 9, 1757.
 What happened after this is not known.
 John Bush's father, George Bush moved to Massachusetts Bay during in the eighteenth century.
 John Bush's mother is unknown.
 George was a farmer in North Parish of Shrewsbury (now Boyleston).
 George died at the age of eighty-years old in 1767.
 John had three brothers who also fought with the Massachusetts militia during the war.
 They were George Bush who died on September 25, 1755 and Joseph Bush who died on April 8, 1756.
Annie Haslam (born 8 June 1947 in Bolton, Lancashire, England) is an English vocalist, songwriter, and painter.
 She is best known as the lead singer of progressive rock band Renaissance since 1971, and for her long and diverse solo singing career.
 She has a five-octave vocal range.
 From 2002, Haslam has developed a parallel career as a visual artist, producing paintings on canvas, painted musical instruments, and giclées.
Tuscany is a 2001 album by progressive rock band Renaissance.
 After a lengthy hiatus, original members Annie Haslam, Michael Dunford, Terence Sullivan and John Tout came together to record a new album, assisted by Roy Wood; Tout was unavailable for the later sessions and was replaced by Mickey Simmonds.
Renaissance are an English progressive rock band, best known for their 1978 UK top 10 hit "Northern Lights" and progressive rock classics like "Carpet of the Sun", "Mother Russia", and "Ashes Are Burning".
 They developed a unique sound, combining a female lead vocal with a fusion of classical, folk, rock, and jazz influences.
 Characteristic elements of the Renaissance sound are Annie Haslam's wide vocal range, prominent piano accompaniment, orchestral arrangements, vocal harmonies, acoustic guitar, bass guitar, synthesiser, and versatile drum work.
 The band created a significant following in the northeast United States in the 70s, and that region remains their strongest fan base.
Annie in Wonderland is the first solo album by Annie Haslam, vocalist with the 1970s band Renaissance.
 It was produced by the multi-talented Roy Wood, who also wrote some of the material, arranged all the songs, played nearly all of the instruments (including an uncredited lead vocal on "I Never Believed in Love"), and illustrated the cover.
 The album features a range of musical styles enabling Haslam to experiment with vocal styles outside the ethos of Renaissance.
 The range for which Haslam is well-known is still apparent, however, especially in the showcase number "Rockalise".
 The album peaked at No. 167 on the "Billboard" "pop albums" chart.
The Intergalactic Touring Band (IGTB) was not an actual music group but rather a science fiction pop music concept album released in 1977 by the now defunct Passport Records in America and Charisma Records in England.
 The ensemble album featured many star performers from progressive rock and other genres, including Meat Loaf, Ben E. King, Larry Fast (Synergy), Percy Jones, Annie Haslam, Rod Argent, Peppi Marchello (Good Rats), and many others.
 The songs are loosely held together by an epic theme of multi-generational space travel and human space colonization.
Annie Haslam is the third solo album by Renaissance vocalist Annie Haslam, released in 1989.
John R. Bush (born August 24, 1963) is an American metal vocalist.
 He came to prominence in the 1980s as the lead singer and lyricist of Armored Saint, a traditional heavy metal band from Los Angeles, California.
 In 1992, he joined the thrash metal band Anthrax, with whom he remained until 2005 and briefly rejoined in 2009–2010.
 Bush has also been active with the reformed Armored Saint intermittently from 1999 to the present.
John DeNicola (born October 4, 1955) is an American songwriter and producer.
 He is best known for co-writing the song "(I've Had) The Time of My Life", for which he won both an Academy Award and a Golden Globe Award, as well as receiving a Grammy nomination, in 1988.
 In 1989 he was the co-winner of ASCAP Awards' "Most Performed Songs from Motion Pictures" for "Time of My Life" as well as for "Hungry Eyes", another song from the film.
 In addition to "Dirty Dancing" hits for Bill Medley, Jennifer Warnes and Eric Carmen, he has also written songs with and for Eddie Money, John Waite, Kristine W, Steve Holy, Jeannie Kendall, Sugar Jones, Annie Haslam, Bernie Worrell, The Sighs and Martin Briley.