Problem Statement

Display the complete lyrics for the song:     99 Bottles of Beer on the Wall.

The lyrics follow this form: ... and so on, until reaching   0     (zero). Grammatical support for   1 bottle of beer   is optional. As with any puzzle, try to do it in as creative/concise/comical a way as possible (simple, obvious solutions allowed, too).

Let's start with the solution:

with builtins;
let
  bottle = x: "${toString x} bottle${if (x == 1) then "" else "s"} of beer";
  beer = { x ? 99 }: if (x == 0) then "" else ''
    ${bottle x} on the wall
    ${bottle x}
    Take one down, pass it around
    ${bottle (x - 1)} on the wall

    ${beer { x = x - 1; }}'';
in
beer { }