Ever since Apple Music got its big redesign last year, you've had access to just two personalized playlists: a favorites mix and a new releases mix. Suffice it to say that this won't cover the bases if you want tunes that suit a specific mood. However, Apple is spreading its wings a bit: it's gradually rolling out its first new custom playlist. The weekly My Chill Mix uses a combination of human curation and an algorithm to deliver songs that help you relax, but also reflect your tastes. You could have a laid-back hip-hop selection, for instance, while your friend gets downtempo electronic tracks.