Who's on First, What's on __
This page is the CodyCross answer for the clue below from Art Museum, Group 730, Puzzle 4 (Charitable Donations).
Question is: Who's on First, What's on __
and the answer is: SECOND
Word Meaning:
SECOND — Number-two; following after the first one with nothing between them. The ordinal number corresponding to the cardinal number two.
Definitions from Wiktionary.