"Kau Ilhamku" (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.

"Kau Ilhamku" is a reworked song of the same name that was composed by Asmin Mudin and sung by Man Bai. Man Bai was given the demo of "Kau Ilhamku" by Asmin in 1993, before it was included on his self-titled album in 1995. 20 years later, in September 2015, Man Bai was contacted by Yonder Music, which showed interest in rerecording the song, albeit in a rearranged manner. On the news of rerecording the song, Man Bai commented, "Around two months ago, I was contacted by them [Yonder Music] who appeared interested in reworking "Kau Ilhamku". They like the melody. I agreed [for them to rerecord it] as long as they don't change the original melody of the song. What is more special is that it involves popular local and international artists." Man Bai later recorded his vocals for the new version of "Kau Ilhamku" in October 2015.Siti Nurhaliza, another artist involved in the creation of the new song, also revealed that she had finished recording her part in the same month. She commented, "When everything was agreed upon, we did my parts in October. Originally I sang the song in its entirety with the new music arrangement. But in the end, the parts [of the song] where I would sing [that were included in the final version] were decided by the producers." Over the course of the months, the new version of "Kau Ilhamku" was recorded and produced in various cities and countries including Kuala Lumpur, Jakarta, and New York City.

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