Audio Recording Through a Web Site

I'd like to create a simple web site where people can do 2 things: 1. Upload an existing audio file (mp3) 2. Record a new audio file right from the web site using their microphone, so no external software is needed. I am not sure what kind of technology is needed, so can't put any numbers on this yet. Please, let me know what it takes and we can get started. Thank you!