Figuring out what apps have your favorite artists and tunes just got a whole lot easier. Performing a search with Google Search regarding a particular artist will return results that can redirect you to music streaming apps that are already installed on your device. The list are apps that contain songs with that particular artist. Currently, the function works in the United States with Rdio, iHeartRadio, Spotify, Google Play, TuneIn, and YouTube.
Source: Inside Search (Official Google Search blog)