"Still The One" By Orleans, Released in 1976.

"Still the One" is a song written by Johanna Hall and John Hall, and recorded by the soft rock group Orleans on their album Waking and Dreaming, released in 1976, which made it to No. 5 on the Billboard Hot 100.
Country singer Bill Anderson recorded and released a successful cover version, peaking at No. 11 on Billboard's Hot Country Singles chart in 1977.
The lyrics of the song are of a man describing his feelings for a woman with whom he has a long lasting and, of course, intimate relationship ("You're still the one, I want to talk to in bed; Still the one that turns my head") and all the reasons why she is "Still the One" for whom he has feelings.
Orleans bass player Lance Hoppen recalls that Johanna Hall wrote the lyrics for "Still the One" after a friend "asked her why somebody couldn't write a song about staying together, as opposed to breaking up"; Johanna Hall wrote the lyrics on an envelope which she then handed to John Hall who Hoppen says "created the music in about fifteen minutes".
John Hall would recall that "Still the One" was not an automatic choice for lead single from Waking and Dreaming saying rather that "we had several songs that were candidates. We were too close to it to see. Fortunately, our producer, Chuck Plotkin, had a strong feeling about the song."