>> best catch phrase demi lovato. ♪ baby, i'm sorry >> worst heartbreak, saying good-bye to tom petty, fats dom know, david cassidy, walter becker and more. best comeback from a hard time away ke$ha. ♪ another big return -- >> i have loved the journey that lorde has been on. the fact that she came back has been a huge gift. >> music this year has been very diverse. one song i liked in particular was a song by logic. ♪ i feel like my life ain't mine ♪ >> best bands you should know -- the killers. best collaboration, haley steinfeld in florida georgia line. ♪