All I wanted to do was play a sample of one randomly selected track.

Clicking the play button doesn't do that, it brings up a somewhat eccentric 2-line license agreement.

Clicking the checkmark to agree then prompts for your email address and to create an account.

These are dark UI patterns, and it's a shame a website purporting to be about generously sharing free content uses them. A button should do what it advertises.

Here's a snippet from the full license text if anyone's curious:

Moby does not permit his Tracks to be used to advertise right-wing politics or causes, or to be used to promote meat, dairy, or other animal products. People may disagree about when these lines have been crossed—which is why Moby retains the right to terminate the license to any Track completely at his sole and absolute discretion, at any time.

Also note you're contracting with a corporation, and the agreement includes a clause about you indemnifying them.