Answer:
I am a word of letters three. Add two and fewer there will be. What word am I?
I am a rock group with four members. All dead one was assassinated.
I am the noblest musical instrument
I have three feet but I cannot walk. What am I?
What has 4 fingers and a thumb but isn't alive?
Whoever made me don't want me. Whoever bought me don't need me. Whoever use me don't know me.