听力原文: More than 60 Country and contemporary Christian artists recently gathered in a Nashville studio to record a performance of 'America The Beautiful. 'The recording session was filmed and will be used in producer Norman Lear' s July 4th ABC television special. Artists on the recording include Vince Gill and his wife Amy Grant, Toby Keith, Kenny Rogers, Phil Vassar, Jewel, Clint Black and his wife Lisa Hartman Black, Lonestar and Keith Urban. How many artists are on the recording?