1. Use the iTunes Preview feature. When you're browsing music in iTunes, you can click the "Preview" button next to any song to listen to a 30-second clip of it. If you like the song, you can then buy it by clicking the "Buy" button. However, you can also simply listen to the preview over and over again for free.
2. Find free songs in the iTunes Store. There are a number of free songs available in the iTunes Store. To find them, simply type "free" into the search bar at the top of the iTunes Store window. You can then browse through the results and find songs that you like.
3. Use a third-party app to download free music. There are a number of third-party apps that allow you to download free music off the internet. Some popular options include Spotify, Pandora, and SoundCloud. These apps are available for both desktop and mobile devices.
It's important to note that not all free music is legal to download. Always make sure that you're only downloading music from reputable sources and that you're aware of the copyright laws in your country.