Guy Theodore Sebastian (born 26 October 1981) is an Australian pop, R&B, and soul singer-songwriter who was the first winner of Australian Idol in 2003. He has released six top 10 platinum/multi platinum albums, five of which have reached the top 4 of the ARIA Album Chart, including a No.1 and 2. He has also released ten top 15 singles, seven of which reached the top 10 of the ARIA Singles Chart, including five No. 1's. Sebastian is the only Australian male artist in Australian music history to achieve five No. 1 singles, and is equal third overall for all Australian acts. With 26 platinum and 2 gold accreditations and over 2 million CD sales in Australia, he has the highest accreditations and sales of any Australian Idol contestant. Sebastian has also reached the top ten on the New Zealand Charts with an album and four singles including two No. 1's, and has four platinum and one gold accreditation there. In 2010 Sebastian was selected to be a judge on the Australian series of The X-Factor.

During his career Sebastian has been nominated for ten ARIA Music Awards, including "Best Male Artist" and "Best Pop Release" in 2010. Previously, three of his albums received nominations for "Highest Selling Album". His debut single "Angels Brought Me Here" won the 2004 ARIA Award for "Highest Selling Single", and in 2010 ARIA announced it was the highest selling song of the previous decade. The song also reached No.1 in four Asian countries and New Zealand. "Like it Like That" the title track of his fifth album was the highest selling Australian artist song of 2009, and "Who's That Girl" the lead single from his sixth album became the second highest selling Australian artist song of 2010 within six weeks of release. Sebastian's other achievements include the "Channel V's Artist Of The Year Award" in 2004, and Urban Music Awards for "Best Male Artist" in 2006 and "Best R&B Album" in 2007.

Sebastian has worked with high profile American musicians. He co-wrote songs with Brian McKnight and Robin Thicke for his second album Beautiful Life, which also included a duet with Mýa. The Memphis Album was recorded with members of the MGs including Steve Cropper, and they were his band on his 2008 Australian tour. Like It Like That features three tracks with John Mayer playing guitar and singing backing vocals, and "Art Of Love", a duet with Jordin Sparks. This album was released in the US in June 2010. "Who's That Girl", from his retrospective album Twenty Ten features US rapper Eve.

Includes the following albums:

2003: Just as I Am
2004: Beautiful Life
2006: Closer to the Sun
2007: The Memphis Album
2009: Like it Like That

and a torrent file to the compilation Twenty Ten.