What are the tracks that Dean Peeters bought?
select t1.name from tracks as t1 join invoice_lines as t2 on t1.id = t2.track_id join invoices as t3 on t3.id = t2.invoice_id join customers as t4 on t4.id = t3.customer_id where t4.first_name = "Daan" and t4.last_name = "Peeters";