How to center an instrument name between two clefs

[Carl Youngblood]

I'm trying to center the piano's instrument name between the bass and 
treble clefs, but I'm having trouble.  Here is my code:

            \context PianoStaff
            <<
                \context Staff=up \context Voice
                {
                    \property Staff.instrument = \markup
                    {
                        \column < \right-align "Organ  " { \right-align 
"(Piano)  " } >
                    }

This works fine but the instrument name is centered on the treble clef. 
 When I try to do:

            \context PianoStaff
            \property Staff.instrument = \markup
            {
                 \column < \right-align "Organ  " { \right-align 
"(Piano)  " } >
            }
            <<
                \context Staff=up \context Voice
                {

I get a the instrument name in front of a third phantom clef.  Any 
ideas?

Thanks,
Carl

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