Question: What is the musical which has "The Rain in Spain" based on?

Context articles: My Fair Lady
It's Raining (album)
Mandy Rain
The Rain in Spain
Rain (SWV song)
Scarlett Santana
Spaniards
Rain's World
Harvest Rain
The Rain Rain Rain Came Down Down Down

My Fair Lady is a musical based on George Bernard Shaw's "Pygmalion", with book and lyrics by Alan Jay Lerner and music by Frederick Loewe.
 The story concerns Eliza Doolittle, a Cockney flower girl who takes speech lessons from professor Henry Higgins, a phoneticist, so that she may pass as a lady.
 The original Broadway, London and film versions all starred Rex Harrison.
It's Raining is the third studio album by South Korean pop and R&B singer Rain.
 The sales as well as success of the album established him as one of the top musical acts in Southeast Asia.
 It is also the first album that Bi (비) uses the English name "Rain" internationally ("Bi (비)" is the Korean word for Rain).
Amanda Rose Moseley (born December 20, 1993) better known by her stage name Mandy Rain, is an American recording artist, dancer, and actress.
 Rain started her acting career at a young age.
 In 2007, Rain auditioned for Star Camp, a Nickelodeon television show that focuses on the making of a super star musical group.
 Rain was chosen along with seven other kids to join the show and The Giggle Club.
 The band disbanded shortly after the series' finale.
 Shortly afterwards, The Giggle Club's producer Nick Cannon decided to groom Rain for a solo career.
 Cannon started bringing Rain to recording studios to record songs while he was drafting a show for her called The Diaries of Mandy Rain.
 After hearing one of the tracks Rain had recorded, Cannon got inspired by it and decided to start drafting a different show about three private school girls.
 After several months, Canon formed School Gyrls.
 The original line up featured Rain, Monica Parales, and Jacque Pyles.
 In the summer of 2009, School Gyrls starred in a movie Canon had written called School Gyrls which premiered on Nickelodeon on February 21, 2010.
 Shortly afterwards, they released a self-titled album "School Gyrls".
 Later that year, they also released a holiday album titled "A Very School Gyrls Holla-Day".
 Rain and Pyles left the group shortly after the release of the holiday album to focus on their solo careers.
"The Rain in Spain" is a song from the musical "My Fair Lady", with music by Frederick Loewe and lyrics by Alan Jay Lerner.
 The song was published in 1956 very similar to piano trio in C minor 3rd movement by Josep Suk.
"Rain" is a 1998 single released by the group SWV.
 The musical backing track is based on Jaco Pastorius's "Portrait of Tracy."
 First heard in 1997 on the group's third album "Release Some Tension", the song was released as a single the next year.
 It peaked at number 25 on the US "Billboard" Hot 100 singles chart and number 7 on the US Hot R&B Singles chart.
 Singer Tyrese appeared in the song's music video.
 He would later sing the hook on "Pullin' Me Back", a song by rapper Chingy, which sampled "Rain".
 Smooth jazz musician and guitarist Norman Brown covered the song on his 1999 album, "Celebration".
 Toronto based producer duo Team Majestic Music, also sampled "Rain" for their song "Let It Fall."
 New York City house producer Baltra sampled it late 2016/early 2017.
Scarlett Santana (born Jasmine Mercedes on May 31, 1988) is an American singer, songwriter, rapper, spoken word poet, dancer, and actress of Puerto Rican descent.
 She made her musical debut with the worldwide smash pop group C+C Music Factory.
 Scarlett Santana has released two singles with the group.
 The first being "Live Your Life", credited as C+C Music Factory presents Scarlett Santana, which was released in early 2010 on a Bill Coleman "Remixxer" compilation album.
 Scarlett Santana and C+C Music Factory then released a Top 10 Billboard smash, "Rain" to DJs in June 2011.
 "Rain" is currently supported by DJ Riddler, David Guetta, Robbie Rivera, StoneBridge and Dave Seaman, and was the No. 1 Breakout on the Billboard Dance Chart in October 2011.
Santana has also become an accomplished co-director for her music videos, such as in "Rain", "Rain (Remix)", and "Live Your Life".
Spaniards are a nation and ethnic group indigenous to Spain that share a common Spanish culture and speak one of the national languages of Spain, including most numerously Spanish, as a primary language.
 Within Spain, there are a number of nationalisms and regionalisms, reflecting the country's complex history and diverse culture.
 Although the official language of Spain is commonly known as "Spanish", it is only one of the national languages of Spain, and is less ambiguously known as Castilian, a standard language based on the medieval romance speech of the early Kingdom of Castile in north-central Spain and the Mozarabic dialect of the Taifa of Toledo which was incorporated by the former in the 11th century.
 There are several commonly spoken regional languages, most notably Basque (a Paleohispanic language), Catalan and Galician (both Romance languages like Castilian).
 There are many populations outside Spain with ancestors who emigrated from Spain and who share a Hispanic culture; most notably in Hispanic America.
Rain's World is the 4th studio album by South Korean pop and R&B singer Rain.
 Two years after his last album, Rain finally came back with his fourth album.
 Building on the success of its predecessor, the album further established him as one of the top musical acts in Southeast Asia.
Harvest Rain is the musical project of Jason Thompkins.
 Born and raised in South Carolina, Thompkins attempts to capture a spiritual dimension of the South in Harvest Rain's music.
 It has been labeled as neofolk music.
 Members include Axel Frank of the German neofolk group Werkraum and also Jamey Thompkins, Jason's younger brother.
 American painter and musician Tor Lundvall has contributed artwork to two Harvest Rain releases, and also collaborated on the track 'Night Chorus' released on the album of the same name.
 Matt Howden also plays guest violin for the first two tracks of their demo "A Frost Comes with the Wind."
"The Rain Rain Rain Came Down Down Down" is a narrative song from the Walt Disney musical film featurette, "Winnie the Pooh and the Blustery Day".
 The song is also incorporated into the 1977 musical film "The Many Adventures of Winnie the Pooh" which is an amalgamation of three Winnie-the-Pooh featurettes including "Blustery Day".
 The song was written by the Sherman Brothers who have written most of the music for the Winnie-the-Pooh franchise over the many years.
 It was sung by an unidentified off-screen chorus with occasional lines sung by veteran character actor Sterling Holloway who provided the voice of Pooh.