Honest... I'm thinking.
Beckoning a variety of operating systems, some of whom are on the other side of a T junctions... oh THAT famous work of art!
Hmmm, I think my answer needs more work.

btw, does Jimbo-wise now mean it's a cab arrét style clue? ie -people will groan! :P

I'm already eager to know...

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BTW... yes, Mr. Hel is right, as it seems, was everyone else except rbud Awww - Best thing to shout about that song> "Leonard Bernstein"
It's an REM list song and a damn good one at that!