He was a founding member of Filipino rock bands Hijo, Bamboo, Introvoys, Passage and Kapatid.

These songs are "Will I Survive", "Di Na Ko Aasa Pa", "Binibini" and "Are You Happy".

In 1994, they released the album Line to Heaven which has melodies that are catchy and pop-inflected, some of which are imbedded in rock-styled arrangements.

The carrier single was written after Arespacochaga suffered a terrible tragedy, the loss of his parents in a car accident.

Kapatid (English: Siblings; Brother/ Sister) came together through an informal gathering of friends with diverse musical talents in other bands.

; Marinito "J-hoon" Balbuena of Kjwan; Ira Cruz previously of Passage; Azarcon; and Chico Molina.

Roy later stated of the breakup, "There was lots of talk about brotherhood and respect and the joy of playing music together.

In 2003, after living in Los Angeles following the Rivermaya tour in America, Mañalac returned to the Philippines.

The first single from the album, "Noypi" (a slang term meaning "Filipino"), was a hard rock anthem that captivated the hearts of the youth and sparked patriotism in the Philippines.

Nathan had originally written the megahit rock anthem "Noypi" for Kapatid, but Karl didn't like it.

In addition to rock, the band incorporated a variety of styles including rap or scat-style singing, as well as a gospel music theme on the song "Alpha Beta Omega".

The album also includes a cover of Sting's "Englishman In New York", presented as a hidden track.

It also includes bonus tracks like unplugged versions of their hit songs from previous albums such as "Mr. Clay", "These Days", and "Hallelujah".

The band's Tomorrow Becomes Yesterday album was certified Platinum status on September 28, 2008 — two days after its release.

The NU Rock Awards recognized "Last Days On A Cruise Ship" as Music Video of the Year.

Three months after the breakup of Bamboo, Azarcon and three former members reunited to form the band Hijo.

The new band is composed of Nathan Azarcon on vocals and bass, Ira Cruz on guitar, and Vic Mercado on drums.

The band also includes Junji Lerma on guitar and Jay-O Orduna on keyboards and backing vocals.