User blog comment:YoSoyAri/Guess the Song!/@comment-24721721-20150825234428

16. If I Didn't Have You by Thompson Square? (Wild guess, but all I could think of with the hint.)

17. Don't Leave Me Hanging by Great Lake Swimmers? (Great Salt lake?)

18. Photograph

19. Flashlight by Jessie J? (She's on JD4, just to let you know, not 3, but I thought that might be a typo.)