A lease is one of the cheaper options for purchasing an instrumental track. Depending on what contract you purchase, you are limited to x amount of streams, unit sales, etc. As a new artist, a lease would be more suitable to test the waters and assess your song's performance before committing to the expense of buying an exclusive track. Afterward, you should self-reflect and decide if purchasing the exclusive rights is the right choice. When you purchase an exclusive track, you get unlimited usage of the beat. The beat will also be taken down from the website and will be unavailable for further sales. This does not mean you have complete ownership of the beat. An exclusive purchase is more like an official reservation.