Zune Called It a Squirt
These cloud music services need to include a proviso for disposable, one-listen links to individual songs. You could cap it to, say, five burner links per month per account.
Jobs had that half-assed press quote about song sharing in the pre-iPhone, pre-apps days, saying to share a pair of earbuds rather than design a vast online architecture and DRM and all that. But I think burner links would be quite nice, in limited use, for those “holy crud check this out” moments that arise when using a cloud music service regularly.
Edit:
Appears this is already in place but, as you might expect, is cripped by Google+ nonsense and not working for all publishers.