Kau Ilhamku"[note 1] (Malay: You are My Inspiration) is a promotional single by various Malaysian and Indonesian artists. It serves as an advertising jingle for a collaboration between streaming music service Yonder Music and telecom provider Celcom Axiata, with a view to promoting the former's music streaming service exclusively available on the latter's mobile telecommunication services in Malaysia and Indonesia.
While "Kau Ilhamku" was originally written by Asmin Mudin for Man Bai in 1993, it was reworked by J-Key and Russel Curtis into an R&B and pop rendition after it received the approval from Man Bai himself. Yonder Music's CEO Adam Kidron handpicked the song himself, citing its catchy rhythm and its status with the Malaysian people as an inspirational song as his reasons for doing so.
"Kau Ilhamku" was made available exclusively for streaming on the Yonder Music mobile app on 18 November 2015 alongside its music video on Celcom and Yonder Music's YouTube accounts. On 19 November 2015, the musical composition was first performed live at The Garage KL in Ulu Klang.