SAN FRANCISCO — Pandora Media Inc. announced today that General Counsel Delida Costin will step down at the end of July.

Costin, who was the Oakland-based Internet radio company’s first in-house lawyer, joined Pandora in 2010 and led the company through its 2011 initial public offering. She will serve as an advisor through Sept. 30, according to an U.S. Securities and Exchange Commission filing.