Spotify - Map shows when two people play same song at same time
Startup Toolkit - Interactive how-to guides to launch your startup
Last.fm - The world's largest online music service. Listen online, find out more about your favourite artists, and get music recommendations, only at Last.fm
Manager checklist - Cheatsheet of things every manager should do
SoundCloud - Enjoy music & follow favourite artists
Where To Post Your Product - A curated collection of 280+ websites to share your startup