I’m a tagger. When I hear a song that’s catchy, or just familiar, I need to know who’s singing it and what it’s called. For this reason, I install music tagging apps on almost every smartphone I use.

Shazam, the music discovery and tagging service, has rolled out a major new update to its iOS app, introducing a single universal app for iPhone, iPad and iPod touch, as well as a slew of other new ...