Hehe, that's cool, it sounds alot like an experience I had a couple of weeks ago, I posted it as 'can you name the song?', but unlike yours I was in a dream when it happened. When it happens while you're in trance it tells you're at a good level of trance and can promptly leave the body.
I believe hypnagogy and phasing are the same thing, if you work up the images and seep into them you will find yourself in another environment.
Maybe you could get part of the lyrics and search on the search engines. I only got 3 words of the song and didn't find anything that would relate. I even heard the announcer saying the time and confirmed it later.
Sounds to me that you were experiencing a form of duality.
From the description, it sounds like you projected (without knowing it), and the images you were getting were a remote feed from that projected double. Then, you just kinda tapped in to it.
I had a few odd experiences this morning that I had never experienced before. I'm good at bringing the separation on but can rarely bring myself to not panic and let go of the physical.
I kept getting very clear images that I could control even though I was aware of my body I'm not sure if they were hypnotic or if it was phasing. I had the separation come on several times but I would panic and end it each time.
At one point I was getting clear images that I could control of what looked like the inside of a building so I decided to try and contract a guide. All I did was I said "hi guide" to see if I could get a response. Right after saying this I heard a low pitched voice like I never heard before say something back that sounded like "hi" but this really shocked me. Also after the voice I was immediately hit with a strong separation that was different then the type I usually feel. After snapping out of it because of panic I got a type of SP which wasn't the same as my usual SP episodes.
The other strange experience was I started to clearly hear a song and I wasn't sure where it was coming from. It was a track that I never heard before and I didn't recognize the people in it. It did go together really well and had a nice beat but there was a chorus and everything. I don't know if I imagined it up but it sounded like something that could have actually gotten radio play. The song was ending and there were a few seconds of silence after that. Next a guy who sounded exactly like a radio announcer started talking. I wasn't expecting this and got shocked and snapped out of it.
Does this sound like my imagination from hypnotic sounds or possibly contacting a guide and listening to some kind of radio station? I should also add that I had a short OBE last week which may be related to a guide because I'm pretty sure that someone pulled me out.