 A vocal coach is sometimes responsible for writing and producing vocal arrangements for four-part harmony for backup vocalists or helping to develop counter melodies for a secondary vocalist.Some vocal coaches may also advise singers or bands on lyric-writing for a music production.Some critics allege that in some cases where popular music recordings credit a singer for work as a vocal coach during a recording, this may be a subtle way of acknowledging a ghostwriting role, in which the coach writes lyrics for a singer-songwriter or rapper.