I am the start of war and end of sorrow. You can't express wisdom without me but I am at the heart of dimwits. You may find me in waves but never in oceans. What am I?
My first letter is in wood but isn't in wolf My second is in four and also in three, My third is in music and also in tune, My fourth is in May but isn't in June. My whole makes a noise, What am I?