I still think of Rivers first when it comes to "Phoenix". After a series of up tempo singles and albums, his Changes album consisted of slow songs and a new haircut (combed forward, not back), and "Phoenix" was the first single from it.
I've often thought about how Rivers' "Phoenix" is one of those forgotten oldies which were popular at the time (at least where I lived in New Orleans), but which have been AWOL on the oldies stations.