The ASEAN Hymn (real name ASEAN Song of Unity) is the Hymn of the Association of Southeast Asian Nations. The lyrics were written by Nicanor Tiongson and the music was composed by Ryan Cayabyab.

The ASEAN Hymn was the unofficial theme until the competition for an official anthem; The ASEAN Way.

Ryan Cayabyab (born Raymundo Cipriano Pujante Cayabyab but known as Mr. C) is a Filipino musician and was the Executive and Artistic Director of the defunct San Miguel Foundation for the Performing Arts. He was also a resident judge for the only season of Philippine Idol in 2006.

His works range from commissioned full-length ballets, theater musicals, choral pieces, a Mass set to unaccompanied chorus, and orchestral pieces, to commercial recordings of popular music, film scores and television specials.

Cayayab's current project includes the Ryan Cayabyab Singers (RCS), a group of seven young adult singers comparable to his prior group Smokey Mountain in the early '90s. After FreemantleMedia decided not to renew the Philippine Idol franchise, Cayabyab transferred to rival show Pinoy Dream Academy (season 2), replacing Jim Paredes as the show's headmaster. PDA 2 started on June 14, 2008.

Ryan Cayabyab was born on May 4, 1954 in Manila, Philippines. His mother died when he was only 6, and his father struggled to support him and his three other siblings. His mother's dying wish was that none of her children would pursue music as a profession, knowing how hard life is for a musician with meager earnings (she was an opera singer).

The Association is a pop music band from California in the folk rock or soft rock genre. During the 1960s, they had numerous hits at or near the top of the Billboard charts and were the lead-off band at 1967's Monterey Pop Festival. As of 2011^[update], they are still performing.

Jules Alexander (born September 25, 1943, Chattanooga, Tennessee) was in Hawaii in 1962 serving a stint in the Navy when he met Terry Kirkman (born December 12, 1939, Salina, Kansas), a visiting salesman. The two young musicians jammed together and promised to get together once Alexander was discharged. That happened a year later; the two eventually moved to Los Angeles and began exploring the city's music scene in the mid-1960s. (Kirkman played in groups with Frank Zappa for a time before Zappa went on to form The Mothers of Invention). Eventually, at a Monday night hootenanny at the LA nightclub The Troubadour, in 1964, an ad hoc group called The Inner Tubes was formed by Terry, Jules and Doug Dillard, whose rotating membership contained, at one time or another, Cass Elliot, David Crosby and many others who drifted in and out. This led, in 1965, to the forming of The Men, a 13 piece folk-rock band. This group had a brief spell as the house band at The Troubadour.