In a pitch that contains songs and folders, you can move songs into different folders.
To move a song into a folder, click the more options option on a song and click the Move to folder option from the dropdown menu.
From here you can select a folder and click the Move button.
In the Move to folder modal, you can also create a new folder to move the song into via the new folder button.
Note: Changes made in a pitch only apply to that pitch.