Cannot get song onto timeline with clips on it???

Here is my problem,

I have a Video Clip that has Audio attached to it. I put them on the timeline. So there is Video on V1 and Audio on A2.

I then have a song I want to use that starts after the clip ends.

I imported my song double clicked it to get into the Source Monitor. I set my In and Out Points on the song. I try to add it to the timeline and it won't add.

Why?

I also noticed that when I put my song into the browser, the V1 and A1 buttons all the way to the left on the timeline go away. I need those to tell Premiere where I want to put my music.

How can I get my song on Audio Track 1  right after the Video and Audio clip ends?

Thanks in Advance

Power Mac Intel Xeon

10GB RAM

Premiere Pro 5.5