Terms: Definition of "Integration with Third Party Services"

[marco-eckstein]

From Spotify Developer Terms of Service, IV 3. f. Integration with Third Party Services:

You will not create any product or service by integrating the Spotify Platform, Spotify Service, or Spotify Content with (i) any non-interactive internet webcasting service or (ii) streams from another service.

How is "integration" defined? Particularly, is my website allowed to integrate both a YouTube player and a Spotify stream, as long as they are not mixed/playing simultaneously?