In order to buy a track, please click on the blue button with a price and a shopping cart icon. This action adds the track to your shopping cart.
If you want to buy the whole album, please click on the blue button and the shopping cart icon next to the album name. This action adds the whole album to your shopping cart.
In order to undo the action, please just deselect the track/album by clicking the button once more.
Then, please go to your shopping cart, in the header, next to your username. In your shopping cart you can check out the tracks/albums. Now they are purchased and ready to be downloaded at any time.
For your convenience, the system is wired not to sell anything twice to the same customer. Thus, it is technically impossible to be charged for the same track or album twice.