How do you get songs on the streetpass playlist?

To get songs on the StreetPass playlist in games like "Tomodachi Life," you typically need to have the songs saved to your game. You can download songs from the Nintendo eShop or use your own music by transferring it to the game via compatible methods. Once the songs are available in your game, they can be shared with other players through StreetPass interactions. Make sure your StreetPass settings are enabled to exchange playlists with others.