Blinking lights weaving between trees in forest.

On back deck w/dog,night, bright, blinking white lights weaving in and out of trees of forest behind home.  The lights appear every April for a few weeks, are seen nightly, it is continuous and a few people have witnessed them with me.  (I have also walked into a conversation of nearby residents discussing these lights.)  The lights react to human speech, singing, clapping, etc.  It is truly incredible as I know of no bugs behaving in this manner.  Location:  Daniel Boone Ntl Forest.  No sound, chilly, dry night,no oddity from usual forest animal activity or sound.