Stealing:

is the illegal taking of another person's property without that person's freely-given consent.

These tracks belong to YELLO. The album has not even been released yet. Sadly the link is available now to everyone on the internet. 

Did YELLO post this link on the internet for everyone. NO! Someone without permission by YELLO has taken YELLO's property and made it available to EVERYONE FOR FREE! 

No different then if I took your lawnmower without your consent and gave it to a friend saying "Keep it. Its a gift"

This is STEALING no matter how you want to twist it, or as I like say "It doesn't matter how much syrup you pour on shit, it doesn't make it a pancake."