# you are like a lovely song to them

"they think that your words are like a lovely song". The people enjoy listening to Ezekiel, but they do not think his message is important enough to obey.

# a lovely song

"a beautiful song" or "a love song"

# that is well played on a stringed instrument

"that someone plays very well on a stringed instrument" 

# stringed instrument

something that has strings and people use to make music