tune_inOnline radio TuneIn has raised $25 million. The funding round was led by Institutional Venture Partners (IVP); existing investors Sequoia Capital, Google Ventures and General Catalyst Partners, also participated.

TuneIn surpassed one billion listening hours in the first four months of 2013, says the company, with more than 227 million listening sessions in the month of March alone.

[Image courtesy: TuneIn]