Answer:
I am an instrument capable of making numerous sound but cannot be touched or seen.
By myself, I'm practically nothing. Worthless as a leader, but when I follow a group, their strength increases tenfold. What am I?
Roast, boast, coast, post. What do you put in a toaster?
I am the book one can never finish reading
What kind of table can you eat?
What do you purposefully put lots of in and on your body, but run away from when you encounter it outside?