  We present high sensitivity radio polarimetric (VLA) observations of a galaxy
with strong orbital resonances - NGC4736. The total radio intensity at 8.4GHz
covers smoothly the whole galaxy bulge and reveals a distinct ring of radio
emission closely related to the ring morphology visible in infrared, CO and
Halpha emission. However, the magnetic field reveals a very coherent spiral
pattern. The magnetic field vectors are crossing the inner starbursting ring,
the dust lanes within the ring and other rather circularly shaped features
visible in other gas traces. Either the magnetic field uncovers the pattern of
gas motions not seen in other spectral ranges, or the spiral magnetic field is
of a pure dynamo origin, ignoring the ringed morphology of the galaxy.
