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If you aren’t playing with Turntable.fm’s addictive, online group-listening service, you’re missing out. But on the other hand, you’re getting more work done than the rest of us.

Now you can take Turntable.fm to go with its new iPhone app. It provides all the features you’ve come to know and love in the browser-based version — creating and joining listening rooms, virtual DJing, chatting and social media integration — in a pint-sized capacitive touchscreen form.

Turntable.fm is one of a number of music-streaming services to attract a following in recent years. Spotify, which has Android and iPh...