KJOI played movie themes done as instrumentals, or with a soft background chorus.
The essence of Beautiful Music is a piano, French horns, and a lot of violins. If you're going to re-create a Beautiful Music sound, some instrumental movie themes with background chorus would be the following ( just off the top of my head).
These versions were charting, and it should not be too difficult to find these singles. Most of these have a choral backing.
Moon River - Henry Mancini
Cuando Calienta El Sol - Los Hermanos Rigual
Exodus - Ferrante and Teicher or Pat Boone, if you want all the beautiful music to be vocals
Lara's Theme - from Dr. Zhivago- Percy Faith
Dear Heart - Andy Williams
Never on Sunday- Hugo Winterhalter
A Time For Us - from "Romeo and Juliet"- Johnny Mathis
Non- movie themes might be:
The Wayward Wind- Gogi Grant
Tennessee Waltz- Patti Page
Canadian Sunset - Andy Williams
Wonderland by Night - Bert Kaempfert
Swingin' Safari - Billy Vaughn
Our Winter Love - Bill Pursell
Music Box Dancer - Frank Mills
I Left My Heart in San Francisco - Tony Bennett R.I.P.
Jean - Rod McKuen
Beautiful Music as a genre is different from soft pop as a genre. So, it's not so much "Muskrat Love" with the squeaky sound effects, or "Honey", ( too maudlin) etc. That is a soft pop sound.
Beautiful Music has a much smoother, or dreamy sound to it. If you have Comcast/Xfinity tv cable service, find the Music Choice channel called "Easy Listening." IMO, that channel is correctly programmed for the Beautiful Music sound. Just my opinion. -- Daryl