  We report the first asteroseismic results obtained with the Hertzsprung SONG
Telescope from an extensive high-precision radial-velocity observing campaign
of the subgiant muHerculis. The data set was collected during 215 nights in
2014 and 2015. We detected a total of 49 oscillation modes with l values from 0
to 3, including some l = 1 mixed modes. Based on the rotational splitting
observed in l = 1 modes, we determine a rotational period of 52 days and a
stellar inclination angle of 63 degrees. The parameters obtained through
modeling of the observed oscillation frequencies agree very well with
independent observations and imply a stellar mass between 1.11 and 1.15M_sun
and an age of 7.8+/-0.4 Gyr. Furthermore, the high-quality data allowed us to
determine the acoustic depths of the He II ionization layer and the base of the
convection zone.
