The Palo Alto Chamber Orchestra or PACO is a youth chamber orchestra based in Palo Alto, California. The emphasis on chamber music sets it apart from other youth orchestras. The orchestra is made up of 5 ensembles (namely SuperStrings, Preparatory, Debut, Sinfonia, and Senior) of about 25 members each who rehearse weekly and perform throughout the year.[1] PACO also conducts international tours with the Senior PACO ensemble occasionally.