Curious as to who's been downloading your tracks? You can find out on your Insights page.
First, head to your My Songs Dashboard. On that page, click Insights on the track you'd like to check out.
On your Insights page, scroll down to the section that says Reach. To the right of Reach, you'll see a drop-down menu that says Filter list.
When you click that, a menu will appear where you can select Downloaded by.
Once you select that, the list below will show all the users who have downloaded your track.