Okay, I just had to post this to see if anyone can answer this for me or has had a similar experience.
I checked out Brad's tutorial on visual meditation a few weeks ago.
I gave it a go, and I guess I didn't fully ask for protection before starting.
I had a vision of meeting 2 very tall slim beings with blond short cropped hair. Not the most friendly looking folk... They were wearing black almost "gothic" looking clothing. They turned and looked at me, and then a shadow passed my left eye in a downwards direction very quickly and that PRECISE moment, the audio on my ipod playing the ISO tones cut out for a split second.
Now I don't know if it was my imagination or what... but the day after I remember feeling quite bummed and not all that "up". I used the Solfeggios that following night though, and that put me back on track.