"Watashi wa Piano"was originally written and composed by the leader of the Southern All Stars, Keisuke Kuwata（桑田佳祐）, for the band's 3rd album, "Tiny Bubbles"(notable for the cover picture of the cute Chaplinesque cat), which had been released in March 1980. It was keyboardist (and future Mrs. Kuwata) Yuko Hara's（原由子）first song as the lead singer. The song had also been set to be sung by another singer, but parties representing Takada related that she REALLY wanted to sing "Watashi wa Piano", which gives a respectful shout out to Larry Carlton and Billy Joel in the lyrics. Blessing was given for Takada to take it instead, and her insistence paid off since the song became the biggest hit of her career, peaking at No. 5 on the Oricon weeklies and becoming the 33rd-ranking song of the year after it had been released in July 1980. Takada's version as well as the original rendition by Hara has that salsa infusion but it is still very much a kayo kyoku song.
Their next album, "Salsa No Tiene Frontera"(There Are No Borders in Salsa) in 1991, included their version of the Kuwata-penned song as "I am a Piano". It's a wonderfully arranged salsa cover and NORA sings both Japanese and Spanish verses. I've provided the concert version here but there is also the studio-recorded one on YouTube.