We have been discussing this issue here https://www.weddingwire.com/wedding-forums/what-are-you-doing-for-favors/4a73e3e373899982.html and I thought I would pull it out into its own thread.
Some people are planning on making mix CDs of songs that are important to them for their favors. I do think this is a cool idea but most people don't realize that it is a copyright infringement.
*It is not legal as long as you legally obtained the music. No matter where you got it, you don't have the right to distribute it.
*It is not legal as long as you aren't making a profit. It is illegal because people are getting copies of the music without reimbursing the recording company/artist that spent time and money making it.
*It is not legal if it is a mix CD. Songs are copyrighted individually, not as a CD collection. Unauthorized distribution of one song is still unauthorized distribution. This is why you can be fined up to $250,000 for downloading or uploading one song.