  This article reviews the present knowledge on oscillating main sequence A/F
stars that belong to more than one class of pulsator. Due to recent results of
asteroseismic space missions, we now know of many Delta Scuti/Gamma Doradus
stars. However, Gamma Doradus variability was also detected in a rapidly
oscillating Ap star, and solar-like oscillations were discovered in a Delta
Scuti star. The astrophysical information that can be gained from these
pulsators is discussed, and confronted with what is believed to be known about
pulsational driving.
