Music is a unifying factor for millennials and streaming is increasingly important to them. 59% tell Nielsen they use radio to discover music, and 65% of that listening is in-car, according to Julianne Schiffer, SVP Insights and Analytics for Nielsen Entertainment, speaking Friday at the Nielsen Client Conference. Over half of that in-car use is on a mobile device. Easy navigation and depth of the service's music library are the most important features, while audio quality is among the least important features.