▁professional ▁models ▁are ▁compens ating . ▁ ▁Some ▁French ▁horn s ▁have ▁an ▁altogether ▁different ▁system : ▁they ▁have ▁a ▁complete ▁set ▁of ▁sl ides ▁on ▁each ▁val ve ▁in ▁B , ▁parallel ▁to ▁the ▁F ▁sl ides . ▁ ▁Press ing ▁a ▁separate ▁trigger ▁routes ▁the ▁air ▁through ▁the ▁B ▁sl ides ▁vice ▁the ▁F ▁sl ides , ▁and ▁via ▁shorter ▁tub ing ▁to ▁the ▁bell . ▁ ▁In ton ation ▁is ▁less ▁of ▁a ▁problem ▁in ▁French ▁horn , ▁because ▁it ▁usually ▁plays ▁using ▁higher ▁harm on ics ▁where ▁use ▁of ▁the ▁ 1 - 3 ▁and ▁ 1 - 2 - 3 ▁val ve ▁combinations ▁is ▁not ▁needed . ▁ ▁Sing ing ▁of ▁an ▁opening ▁phrase ▁In ▁vocal ▁music , ▁in ton ation ▁can ▁sign ify ▁the ▁singing ▁of ▁an ▁opening ▁phrase . ▁For ▁example , ▁compos itions ▁of ▁sacred ▁vocal ▁music , ▁or ▁sections ▁there of , ▁often ▁only ▁start ▁after ▁the ▁first ▁phrase , ▁meaning ▁that ▁that ▁first ▁phrase ▁has ▁to ▁be ▁in ton ed ▁according ▁to ▁a ▁traditional ▁( us ually ▁Greg or ian ) ▁mel ody . ▁Where ▁that ▁tradition ▁was ▁not ▁u ph eld , ▁an ▁in ton ation ▁had ▁to ▁be ▁composed ▁afterwards ▁for ▁a ▁performance ▁of ▁the ▁complete ▁work . ▁Johann ▁Sebastian ▁Bach ▁composed ▁such ▁inser ts ▁for ▁church ▁music ▁by ▁other ▁compos ers , ▁for ▁example ▁the ▁Cred o ▁in ton ation ▁in ▁F   major , ▁B W V ▁ 1 0 8 1 , ▁for ▁the ▁Cred o ▁of ▁one