Time to make my annual contribution to the thread, but the answer is the same as it has been for years:
Late 70's, early 80's soft rock. That's it. All day, all night. Steely Dan. The Doobies (with and without Michael McDonald.) Michael McDonald. Boz Scaggs. Toto. Christopher Cross. Al Jarreau. Little River Band. George Benson. If I want to rock a bit more, maybe some Atlanta Rhythm Section. Some more obscure artists like Pages, Bill LaBounty, so many others!