Sec. 2. It shall be the duty of such supervisor to visit the schools of the county and help the teachers with their classwork, in music by teaching demonstration lessons for them, suggesting methods of presenting the work and aiding in every possible way to improve classroom instruction in music. The supervisor, in cooperation with the County Superintendent, may call meetings of the teachers of the county when deemed necessary for the purpose of discussing with them their problems, and it shall be the duty of said teachers to attend such meetings whenever called. Said supervisor, when not visiting schools, shall render assistance in the office of the County Superintendent of whatever nature may be necessary if demanded by the County Superintendent.