Keith Urban and Steve Martin will perform Wednesday night (May 20) on American Idol's season finale. As previously announced, Carrie Underwood will perform "Home Sweet Home," this year's American Idol farewell song, during an appearance on Tuesday's (May 19) show. Details of Urban's appearance have not been announced, but Martin will play a song from The Crow: New Songs for the Five-String Banjo, his bluegrass album that Rounder Records released to all music retailers on Tuesday (May 19) following an exclusive release by Amazon.com. Martin is also scheduled to perform with the Steep Canyon Rangers in New York City on May 27 and 28. Martin will also be the featured guest during Vince Gill's portion of the Grand Ole Opry in Nashville on May 30.