Has Olivia Newton John recorded "Summertime"

I heard a great female vocal in a restaurant today. The hostess said they had sattelite radio and the singer was Olivia Newton John singing "Summertime." Has anyone heard this recording? I can't find it. Joel
Not sure if this is what you hear but Charlotte Church has also recorded that song.
All Music Guide indicates that she has recorded this song on a 2004 release titled "Indigo: Women of Song" which is apparently an Australian release. I am going to try to attach a link to All Music Guide but I am not sure if it will work.