All 16 words, sorted alphabetically. Group them into four categories of four.
The four category names, easiest to hardest. No words revealed yet.
Theme name plus one word from each category.
BIND, HOT WATER, JAM, and PICKLE are all idiomatic expressions meaning to be in trouble or a difficult predicament (e.g., 'in a bind,' 'in hot water,' 'in a jam,' 'in a pickle')
KEY, PITCH, SCALE, and TONE are all fundamental concepts in music theory, referring to musical keys, the frequency of a note, the sequence of notes, and the quality of a sound
A BALLOON, KITE, TEA BAG, and YO-YO all have strings attached to them as a functional part of their design
ARROW, LIGHTNING, ROCKET, and WIND are all used metaphorically to describe extreme quickness (e.g., 'fast as an arrow,' 'quick as lightning,' 'like a rocket,' 'gone like the wind')