If one designed a horn to have the same (relative) frequencies as a Cepheid variable star this is would it would look like:
(graphics by Z.
Kollath)
Buchler, J. R. & Kollath, Z., 2001, Strange Cepheids and RR Lyrae, Astrophysical Journal, Vol. 555, p. 961-966; astro-ph/0101392 ApJ
Buchler, J.R., Yecko, P.E. & Kollath, Z., 1997, The Nature of Strange Modes in Variable Stars, Astronomy & Astrophysics, Vol. 326, 669-681. source    A&A
Work supported by National Science Foundation.