Gravitational wave astronomy around 0.1-10 Hz

I discuss the prospects of gravitational wave astronomy around 0.1-10Hz. This frequency regime is just between the two bands probed byground-based detectors (LIGO, Virgo, KAGRA,..)  and the proposed spacedetectors (LISA, TianQin, Taiji). I briefly introduce the Japaneseplan DECIGO targeting this band and then discuss its main sciencetargets, including primordial stochastic background and compactbinaries.