¿Quién será? "¿Quién será?" is a bolero-mambo written by Mexican composer Luis Demetrio, who sold the rights to fellow songwriter Pablo Beltrán Ruiz. Beltrán recorded the song for the first time with his orchestra in 1953. Pedro Infante, for whom the song was written, recorded it in 1954. Norman Gimbel took the song, removed the somewhat melancholy Spanish lyrics about a man wondering if he shall ever love again, and wrote brand-new English lyrics about a man praising his dancing partner's ability to affect his heart with how she "sways" when they dance. This new song, titled "Sway", has become a standard in both the pop and jazz repertoire. The first version to achieve considerable success in the United States was recorded by singer Dean Martin with the Dick Stabile orchestra in 1954. The first rendition of Luis Demetrio's "¿Quién será?" was recorded by Pablo Beltrán Ruiz with his orchestra as an instrumental cha-cha-chá in 1953. This version was later included on the LP "South of the Border / Al sur de la frontera - Cha-cha-cha". According to Demetrio, Beltrán only contributed the first few chords of the song. The rest of the composition and the original lyrics (in Spanish) were all written by Demetrio. However, because Demetrio sold his rights to Beltrán, the song has often been misattributed to the latter. Beltrán re-recorded the song on numerous occasions including an upbeat cumbia version for the album "Mister Cumbia" (1966), a ska version for the album "Caliente, caliente... a go-go" (1966) and a boogaloo version for the album "Rosita bonita" (1968), all released by RCA Victor. The cumbia version was featured in the 1967 Cantinflas film "Su Excelencia". Demetrio had written the song specifically for Mexican singer Pedro Infante, who performed it in the film "School for Tramps" in 1954 and later recorded it for Peerless Records. It became one of Infante's signature songs and a hit across Latin America. Shortly after, Germán Valdés, better known as Tin Tan, performed a parody version of Infante's rendition in the film "The Viscount of Monte Cristo".