I do not think the OP meant to spam, I am having issues buying tracks too. When I check-out, I get the option to pay by credit card or by paypal. In both cases, I get an error message "We're sorry, but something went wrong."
UPDATE: after trying a few times, it went through with the VISA option. I guess it was a transient issue.
UPDATE: after trying a few times, it went through with the VISA option. I guess it was a transient issue.