You can download free songs to your phone by using the Free On iTunes feature on iTunes or downloading from websites that provide royalty-free content. Incompetech is one example that has an extensive database of royalty-free music.
To promote content, Apple regularly shares free music on iTunes. In addition to music, the promotion includes TV shows and movies. To access the free content, head to the iTunes Store, and tap the blue Free On iTunes button. Instead of the usual Buy button, iTunes displays a Get button for free content.
Individual artists such as Kevin MacLeod may choose to publish their content for free on websites that include Incompetech. To download a song from the website, click Get Started With Music, click a song from the list, and click the blue Download As MP3 button.