accompaniment
     n 1: an event or situation that happens at the same time as or in
          connection with another [syn: {concomitant}, {co-occurrence}]
     2: a subordinate musical part; provides background for more
        important parts [syn: {musical accompaniment}, {backup}, {support}]
     3: the act of accompanying someone or something in order to
        protect them [syn: {escort}]
Source: WordNet® 2.0