Music ID app SoundHound now has around 100m users, with more than 200,000 joining per day.
Katie McMahon, VP of SoundHound said: "We have an incredibly active user base which has driven the growth of SoundHound virally as our users have amazing experiences and recommend us to their friends,"
The app lets users identify songs, see recommendations based on their recent searches, listen to free new music, discover new artists and watch videos.
The firm believes it has been actively used on one in nine of the 900m iOS and Android devices activated.
SoundHound was the first app to offer unlimited free tagging, and also the ability to identify a tune by humming it.
Source: Mobile Entertainment