Reason is the second solo album by English singer Melanie C, released on 10 March 2003 by Virgin Records. It was the follow-up to Northern Star, and reached number five on the UK Albums Chart, selling 30,876 copies in its first week. Although not performing as well as Northern Star, Reason was certified Gold in the United Kingdom, with 101,889 copies sold. The album has sold 500,000 copies worldwide. The album has been released with the Copy Control protection system in some regions. Most reviews for the album were mixed.

"Yeh Yeh Yeh" is a song by British singer-songwriter Melanie C. It was the third and final single from Chisolm's second solo album, Reason (2003). The song was released as a double A-side with "Melt" in the United Kingdom. In the rest of Europe, "Yeh Yeh Yeh" was released alone as the final single. The song was also sampled for a remix of the song "Tanha Dil" by Indian singer, Shaan.