A is for (whoever gets Z starts the next theme)

[twyngwyn]

Grows on a tree

A is for Almond

[electric*mayhem*band]

P is for Pint.

[crosbystills]

Q is for Quart

[electric*mayhem*band]

R is for Ream.

[twyngwyn]

R is for Rod

[crosbystills]

S is for Second

[electric*mayhem*band]

T is for Ton. (Or Tonne).

[twyngwyn]

U is for Unit

[crosbystills]

V is for Volt

[twyngwyn]

W is for Watt

[electric*mayhem*band]

X is for X Unit.