Excellent choice my good man. This genre of music is "American Standards" or "The Great American Songbook" and it's a sub-genre of Jazz, so I am on board and listen frequently to American Standards. Most of the classic Standards singers, like Peggy Lee, Frank Sinatra, Johnny Hartman and even Bing Crosby started as pure Jazz singers. Crosby was in a band with Paul Whiteman called "The Rhythm Boys".
And believe it or not, this is one of the first Music Videos EVER made in the 30s. Actually, this is 1930! Amazing. And IN COLOR.
Bing Crosby, Paul Whiteman and the Rhythm Boys, "So the Bluebirds and the BlackBirds Got Together".
https://www.youtube.com/watch?v=BUE_Ploe0gk