The question of whether the vibrations of a metal flue organ pipe contribute to the perceived sound or not is still not completely answered. One result of the research done within the GOArt (Göteborg Organ Art Center) project is that, due to the casting process and the need to save material, the baroque flue organ pipe has considerably thinner walls than a modern pipe. According to an organ builder, the pipe under test is likely to vibrate. To demonstrate the influence of the wall vibrations on the perceived sound, recordings of a blown pipe with and without damping of the wall are carried out. An FE model is created and the radiation for the case of coupled air and structural modes are calculated to enable parametric studies of the influence of the wall properties. The simulations are compared to FRF measurements using MLS excitation of a shaker, laser vibrometer velocity measurements, and subsequent modal analysis. The results indicate that some structural modes significantly change the spectral components in the transient spectra of the blown pipe, whereas in the stationary spectrum, the effect is small. [This work was performed at the Department of Applied Acoustics, Chalmers University of Technology, Göteborg, Sweden.]