</s> ▁Tun ed ▁B ott les ▁are ▁musical ▁instruments ▁in ▁the ▁per cussion ▁family ; ▁they ▁are ▁found ▁objects ▁which ▁are ▁subsequently ▁filled ▁with ▁water ▁to ▁create ▁different ▁pitch es . ▁ ▁The ▁instruments ▁has ▁the ▁range ▁of ▁at ▁least ▁one ▁oct ave , ▁as ▁it ▁is ▁possible ▁to ▁perform ▁complex ▁mel od ies ▁with ▁it ▁( Mich el ▁Lau zi ère ▁has ▁performed ▁Sym phony ▁No . ▁ 4 0 ). ▁The ▁instrument ▁also ▁has ▁been ▁seen ▁in ▁Euro vision ▁Song ▁Cont est ▁ 2 0 0 8 , ▁Cro at ian ▁entry ▁" R oman ca " ▁by ▁K ral je vi ▁u lice . ▁In ▁this ▁performance ▁bott les ▁are ▁seen ▁h anging ▁on ▁threads ▁in ▁front ▁of ▁the ▁player ; ▁this ▁may ▁improve ▁the ▁sound ▁or ▁add ▁convenience . ▁The ▁range ▁depends ▁on ▁the ▁bott les ▁used ▁but ▁is ▁generally ▁on ▁a ▁high ▁frequency ▁side . ▁It ▁can ▁be ▁made ▁chrom atic ▁( 1 2 ▁bott les ▁per ▁oct ave ), ▁or ▁only ▁have ▁bott les ▁required ▁for ▁the ▁music ▁being ▁played . ▁ ▁Em pty ▁bott le ▁sounds ▁about ▁half ▁oct ave ▁higher ▁than ▁the ▁same ▁bott le ▁filled ▁in ▁with ▁water . ▁Com bin ing ▁different ▁bott les , ▁it ▁is ▁possible ▁to ▁reach ▁the ▁range ▁of ▁one ▁oct ave ▁or ▁more ▁( a ▁typical ▁bott les ▁sound ▁somewhat ▁from ▁C 7 ▁till ▁C 8 , ▁for ▁instance ), ▁trans pos ing ▁notes ▁from ▁other ▁oct aves ▁into ▁this ▁range . ▁ ▁Tun ed ▁bott les ▁were