Below is the link to an excellent history of KVOO-AM,this 50,000 watt
"Voice of Oklahoma" saw such greats as Paul Harvey and of course Bob
Wills in its studios over the years.The station has now changed call
signs and at last report is broadcasting Talk Shows and
News.Signifigantly the last song played under the KVOO call letters
was appropriately enough Bob Wills "Take Me Back To Tulsa".

http://tulsatvmemories.com/tulrkvoo.html