How do I get the guitarist's note?

Hint 1 of 7:

Well, once you get near him, it's really not all that hard.

Hint 2 of 7:

Some items on this screen work differently when a lot of weight is placed
on them.

Hint 3 of 7:

Like the weight of two different goblins.

Hint 4 of 7:

You'll need to use the spring that made the pump appear.

Hint 5 of 7:

Stand on the spring without actually clicking on the word "spring" (F), and
then click on the spring while Fingus is still standing on it (W).

Hint 6 of 7:

That door will take you near the guitarist.  Walk through it.