Pandora has added full detailed song credits to users across all tiers of its service on the web and on new desktop apps for Mac and Windows. To view the full list of credits, users click on “See All Song Credits” to see all of the people who participated in in the recording from background singers to songwriters to the guy who played the marimba on “Sweet Emotion.”
Source: Pandora Adds Detailed Song Credits As Recording Academy Plots ‘Behind the Record’ Campaign