The three words below can be changed into other words according to a well-known theme. What is the theme and what are the new words?

SHONE
T-BONE
IN STONE
ENTHRONE

Answer:

The letters (word) ONE can be replaced by ALL to form new words - according to The Three Musketeers' theme: ALL FOR ONE AND ONE FOR ALL:

SHALL
T-BALL
INSTALL
ENTHRALL