"Dirgahayu" (Perpetuity) is a duet single by Malaysian artists, Faizal Tahir and Siti Nurhaliza, released on 12 August 2016. It was released to serve as a theme song for a 100-episode Malaysian television series, Lara Aishah. Co-written by Faizal himself, it was recorded in July 2016 before it was released a month later.
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