Instrumental only music and some of it is really great for beginning, end, and background music for training. Royalty free, and big selection! They specifically indicate you can use their music for a 'variety of projects'.
I have a situation where I want to display code that has specific leading spacing in the code sample and I want the learner to be able to view the proper design and copy and paste it into thier coding system. Right now when I put the spacing in dominKnow it deletes and removes the extra spaces after I add the object.