15. Demi Lovato, 'Tell Me You Love Me'
The sixth album from Demi Lovato reaches its peaks when the pop princess unleashes her powerful voice, which can leap octaves in a single bound and – as "Sorry Not Sorry" proved every time it crash-landed into drive-time – upend the chilled-out mundanity that dominated 2017's radio landscape. Lovato's instrument is in fine form on the regretful "You Don't Love Me Anymore," a tour de force ballad that allows her to turn vowels into Silly Putty; "Sexy Dirty Love" zaps her into robot disco; and "Concentrate" strips down as it heats up. Lovato's enthusiasm is so apparent that it even makes the lyric "Coldplay on the radio" sound kind of seductive. M.J.