Multiple choirs

[Jon-o Addleman]

I have a problem with arranging multiple choirs - I have a piece for
two satb choirs, and I'd like it displayed as two choirstaffs
connected at the end. However, when I just do this:

\score {
        <
                \context ChoirStaff <
                        \context Staff ="cantus1" <
                                ...
                        >
                        \context Staff ="altus1" <
                                ...
                        >
                        \context Staff = "tenor1" <
                                ...
                        >
                        \context Staff = "bassus1" <
                                ...
                        >
                >

                \context ChoirStaff <
                        \context Staff ="cantus2" <
                                ...
                        >
                        \context Staff ="altus2" <
                                ...
                        >
                        \context Staff = "tenor2" <
                                ...
                        >
                        \context Staff = "bassus2" <
                                ...
                        >
                >
        >
}

I get the Bassus1 staff directly above the cantus1 staff - no space
in between whatsoever. Obviously, that's not what I want. How should
I be doing this? BTW - if it's not obvious, I'm quite new at this...
<G>

-- 
Jon-o Addleman