Ask Siri to name a tune
As of iOS8, Siri now has the functionality of Shazam built in. You can now ask Siri ‘What song is this?’ or ‘What’s this song?’ when you hear music playing on an external device.
To test it out, start the song playing you want to identify. Ask Siri ‘What song is this?’. Siri will reply ‘Let me listen.’
Siri will most likely take a few seconds to recognize the song. Once it does, Siri will respond by saying something like ‘I can name that tune.’ and will both speak the title and artist as well as a song cover and ‘buy’ link to the iTunes store.