What have I done? I don't know what to search for. . . . . .

I am unable to select clips. . . . usually when I click on them one time they turn black and I can move or delete them.  I even have the ability to grab the end of the clip and non destructively slide the end of the clip to remove unnecessary edges.

Now my curser is a speaker looking thing I cannot select anything and when I attempt  to grab and move clips the sound of the clip plays either back wards or forwards slowly depending on which way I drag.  

What have I clicked on to lose control of my ability to select clips? Thanks  JP