Rachmaninoff's op.  20 is the "Spring" cantata.  op.  21 - hrm, having
trouble finding out what it is, but op.  21 no.  5 is Lilacs.  Ah...  I
see.  op.  21 is a collection of songs with piano.  (op.  23, of course,
is preludes.) I haven't heard it, but there's a recording on Chandos
whose performers and coupling are intriguing (Turovskys, coupled with
Miaskovski's beautiful a minor 2nd sonata op.  81, a work I also know and
recommend.)

Eric Schissel
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http://www.lightlink.com/schissel ICQ#7279016