'What music should I play?': In battle of Google, Alexa and Siri, here's who answers best

Jefferson Graham takes a look at two products that bring Alexa and voice-activated controls to the auto, Garmin Speak and Roav Viv. LOS ANGELES -- "Alexa, what music should I listen to?" It's an interesting question that follows up with Amazon's Alexa asking follow-ups, one of the few times the personal assistant gets really conversational and makes suggestions. Alexa, via Amazon Music, gave me options: the late, legendary gypsy guitarist Django Reinhardt or singers Adele or James Taylor. I went for Django, and with that, my personal DJ robot had followed through successfully, finding three artists I love. Such it is with music commands for personal assistants.