Any way to easily remove leading silence?

For example, say I have a song that has 20 seconds of leading silence. It's too much waiting. I want to cut it to 10 seconds. I can change the .ogg file easily. But I have all the notes, beat map, RS sections, fret hand positions, etc. Any easy way to shift all that in EOF or am I out of luck?

41 minutes ago, BananaPancake said:

Any easy way to shift all that in EOF or am I out of luck?

Moving the very first beat of the song shifts everything forwards/backwards, notes, beat map, RS sections, fret hand positions and everything. You can just do that after removing some of the silence in audacity.

If you haven't done anything after adding the silence you can just ctrl + Z to undo and re-add the silence with a lower amount.

That worked great, thanks. I had to play a bit with the offset to get it right.

I was sure I tired that, but I guess I only tried moving other beats, which just stretched the section between anchors.