Listening to the tall grasses hitting a glass sheet

The tall grasses in the old river bed were extraordinary on this visit. As usual there was a gusting wind and this was catching the grasses and creating sounds of contact as the stems knocked into one another. We had a sheet of glass with us so i dug a small trench, positioned it among the grasses, attached an AKG C411L and listened to the results. The contact microphone on the glass also picks up the sound of cows, birds and a passing tractor.