Los Chimpos Ride Again

You sit down on a chair and open the note, making sure the door is closed.

It is written in a neat script, in red ink, and makes little sense.
It reads;

I know what you are looking for.
I know where you should start looking.
I know you know that I know these things.
Find me where the celestial orchestra meets the horticultural worker to share the amber nectar.

You stare at it puzzled, and read it again, until you figure out that it is obviously a riddle of some sort.
But what could it mean?

The phone is dead and the messenger has gone so you've no way of asking anyone for help.
What could this note mean?