Coeval Observations of a Complete Sample of Blazars with Effelsberg,
  IRAM 30m, and Planck
  We present the outline and first results of a project using the synergies of
the long term blazar radiomillimetre monitoring program F-GAMMA, the continued
scanning of the millimetre-submillimetre sky by the Planck satellite, together
with several dedicated observing programs at the Effelsberg 100m telescope, to
obtain a data sample unprecedented in both time resolution and frequency span.
