You can try most of the songs from Katy McAllister. It depends if you like songs that are generally meant to be more or less quite sad, yet they don't have 'sad' beats to them. I'm sure you'd understand if you listen to some of her songs. Some below that I find really good:
https://www.youtube.com/watch?v=Cqv9ZHveNbk
https://www.youtube.com/watch?v=XCsGp25dvAI
I'm afraid I'm not going to include my top ten because the list changes and this depends on my mood, but the first one is usually 'approachable' with all my moods. One you can try is "All About You" by Birdy. Generally not sad, but I love the tune and the way Jasmine sings. Plus, the lyrics are awesome!