At last check, I have 116 apps on my iPhone, 101 of which I never use. But that doesn't mean I'm not on the lookout for new ways to waste my time waiting to pick up my order of pad thai at my place down the street.
Yesterday, a company called musiXmatch released a "lyrics appliation" for iOS and Android. Lyrics--that's its name--uses "patented music matching algorithms to find and instantly match lyrics to your entire mobile music library." And yes, this is legal because musiXmatch has correctly licensed the lyrics to 5.5 million songs. This is why labels and publishers often come down hard on sites that offer song lyrics for free.