Daniel Ek is quoted as saying:
"We understand people’s concerns about their personal information and are 100 percent committed to protecting our users’ privacy and ensuring that you have control over the information you share."
Going forward you may be asked by Spotify access to types of information including photos, your mobile device location, voice controls, and your contacts. You do NOT have to share any of this information if you do not want to. If you allow access to this information, allegedly spotify will only use it for you to "customize your Spotify experience".
Your photos, your location, your voice microphone, and your contacts will not be accessible without your explicit permission. Some information is shared on Spotify's service. However, according to Daniel Ek none of your personal information is shared.