"Dirgahayu" [Note 1] (Perpetuity) is a duet single by Malaysian artists, Faizal Tahir and Siti Nurhaliza, released on 12 August 2016.

On 22 August 2016, a lyric video for the song featuring clips from Lara Aishah was published on Faizal's official YouTube account.

The news about the recording arose when Faizal Tahir talked about it at his iAMFAITHMEN's Eid al-Fitr open house at The Gardens in Mid Valley on 20 July 2016.

[3] She offered him a chance to produce and record a duet with Siti Nurhaliza for her production house's latest television series, Lara Aishah.

By happenstance, the production company, Global Station Pte Ltd proposed to me to compose a song with her for a 100-episode drama series for Astro.

[12] "Dirgahayu" was first performed live at Rumah Terbuka Sesuci Lebaran, an Eid al-Fitr open house by Siti Nurhaliza on 31 July 2016 at JW Marriott Kuala Lumpur.

[19] The music video premiered at the 22nd Anugerah Industri Muzik as the backdrop during the live performance of "Dirgahayu" by Siti and Faizal on 18 December 2016.