Well, the OP did ask for "music symbols that can be inserted into Word
docs," not a way to create sheet music.
--
Suzanne S. Barnhill
Microsoft MVP (Word)
Words into Type
Fairhope, Alabama USA
http://word.mvps.org
That could be useful for inserting symbols into running text. But it
couldn't do more than the simplest example of music on a staff. (No
way to slant the beams, for instance.) The major commercial packages
(such as Finale and Sibelius) have student versions that seem to be a
free download and must include at least some of their special fonts if
only so that the student can read the file distributed by the teacher
(like the relationship between Acrobat and Reader).