Question: Which singer, Phil Lewis or Siouxsie Sioux, released the top single, "Peek-a-Boo"?
Context: The Creatures were a band formed in 1981 by Siouxsie and the Banshees members Siouxsie Sioux and Budgie.  With the dissolution of Siouxsie and the Banshees in 1996, the Creatures graduated from an occasional project to a full-time concern.  The drum and voice duo released four studio albums: "Feast" in 1983, "Boomerang" in 1989, "Anima Animus" in 1999 and "Hái! " in 2003. Philip Francis Lewis (born 9 January 1957) is the English vocalist for the American hard rock band L.A. Guns.  He was born on 9 January 1957 in London, England.  He has lived and worked in the U.S. since the 1980s but was privately educated at Royal Russell School in Surrey, England. "The Staircase (Mystery)" is a song by English post-punk band Siouxsie and the Banshees, released as a stand-alone single in 1979 by record label Polydor.  The track was written by Siouxsie Sioux, Steven Severin, John McKay and Kenny Morris, and was produced by Nils Stevenson.  The B-side of the single was a cover of the T. Rex song "20th Century Boy". Hyæna is the sixth studio album by English rock band Siouxsie and the Banshees, released in 1984.  The opening track, "Dazzle", featured strings played by a 27-piece orchestra called the "Chandos Players"; it was scored from a tune that Siouxsie Sioux composed on piano.  "Hyæna" is the only studio album that guitarist Robert Smith of The Cure composed and recorded with Siouxsie and the Banshees. "Happy House" is a song by English post-punk band Siouxsie and the Banshees.  The song was written by Siouxsie Sioux and Steven Severin and was released in 1980 by record label Polydor as the first single from the band's third album, "Kaleidoscope". "Christine" is a song by English post-punk band Siouxsie and the Banshees.  The song was written by Siouxsie Sioux and Steven Severin and was released in 1980 by record label Polydor as the second single from the band's third album, "Kaleidoscope". Siouxsie and the Banshees were an English rock band, formed in London in 1976 by vocalist Siouxsie Sioux and bass guitarist Steven Severin.  Initially associated with the English punk rock scene, the band rapidly evolved to create "a form of post-punk discord full of daring rhythmic and sonic experimentation".  In 1978, they released their critically acclaimed debut album, "The Scream", and built their reputation over the next few years through subsequent releases.  With "Juju" in 1981, the group also became an important influence on the emerging gothic rock scene.  They disbanded in 1996, with Siouxsie and drummer Budgie continuing to record music as the Creatures, a second band they had formed in the early 1980s.  In 2004, Siouxsie began a solo career. Susan Janet Ballion, better known by her stage name Siouxsie Sioux (/ˈsuːziː suː/ , born 27 May 1957), is an English singer, songwriter, musician and producer.  She is best known as the lead singer of the alternative rock band Siouxsie and the Banshees (1976–1996) and the drums-and-voice duo the Creatures (1981–2005).  Siouxsie and the Banshees released 11 studio albums and several UK Top 20 singles including "Hong Kong Garden", "Happy House", "Peek-a-Boo", plus a US Billboard Top 25 hit "Kiss Them for Me".  With the Creatures, Siouxsie recorded four studio albums and the hit single "Right Now".  She has also sung with artists such as Morrissey and John Cale.  After disbanding the Creatures in the mid-2000s, she has continued as a solo artist and released "Mantaray" in 2007. Feast is the debut album by British duo the Creatures (comprised by Siouxsie Sioux and musician Budgie, then-members of the band Siouxsie and the Banshees).  It reached No. 17 in the UK Albums Chart and the "Miss the Girl" single peaked at No. 21.  With their first album, the band embraced exotica, including "waves crashing on beaches", "found-sound effects from nature" and local Hawaiian chanters.  Critic Ned Raggett described it as "a lush, tropical experience". "Interlude" is a single by Morrissey and Siouxsie Sioux released in August 1994.  It was presented under the banner of "Morrissey & Siouxsie".
Answer: Siouxsie Sioux