This is a Nightingale Thrush singing in May, in Mooste, Estonia. The bird has chosen to sing very close to a humming electrical box nearby; this accounts for the low-level buzzing sound. There are several of these birds around MoKS in Estonia and at night in the Summer they sing for hours and hours. It is an utterly incredible sound. #twitchr #nightingalethrush #songbird #birdsong