Before we get started
After spending over 20 years working with Macs, both old and new, theres a tool I think would be useful to every Mac owner who is experiencing performance issues.
CleanMyMac is highest rated all-round cleaning app for the Mac, it can quickly diagnose and solve a whole plethora of common (but sometimes tedious to fix) issues at the click of a button. It also just happens to resolve many of the issues covered in the speed up section of this site, so Download CleanMyMac to get your Mac back up to speed today.
With QuickTime Player, you are able to rip audio from videos, well providing the format is supported by QuickTime.
This method can be used for piracy, which is illegal, so make sure that you use this responsibly.