  SOLO – one voice   DUET – Two people singing together   CHOIR – A group of people singing together (SATB = Soprano, alto tenor & bass voices)   UNISON – two or more voices sounding at the same pitch or an octave (8 notes) apart   HARMONY – the sound of two or more notes made at the same time   A CAPELLA – unaccompanied singing   ACCOMPANIED – when instruments are played along with the singing   DESCANT – a melody above the main tune, mainly in vocal music e.g.