Cov twj paj nruag yog ib ceg tseem ceeb ntawm tsev neeg cov cuab yeej suab paj nruag, thiab hauv cov suab paj nruag classical thiab txawm tias niaj hnub no, yuav luag tag nrho cov suab paj nruag lyrical raug ntaus los ntawm cov suab paj nruag. Nws tuaj yeem pom tias softness thiab kev zoo nkauj yog cov yam ntxwv ntawm txhua txoj hlua. Lub cav ntawm txoj hlua yog sib koom ua ke thiab muaj ntau theem kev qhia lub zog: lawv tau nce siab thiab mob siab rau thaum lub sij hawm sib dhos, maj mam thiab graceful thaum solo; Thiab vim hais tias ntawm kev nplua nuj thiab ntau yam txuj ci archery (tawv, rhuav, plucking, dhia, thiab lwm yam), nws muaj xim zoo nkauj.
Kev hais lus ntawm cov hlua cia siab rau cov neeg kho tshuab quab yuam kom vibrate cov hlua tensioned, yog li txwv qhov ntim ntawm lawv cov lus. Cov cuab yeej siv hlua feem ntau siv cov hlua sib txawv los ua cov ntawv sib txawv, thiab qee zaum yuav tsum siv cov ntiv tes los kho qhov ntev ntawm cov hlua kom ua tiav lub hom phiaj ntawm kev hloov lub suab.
Cov cuab yeej siv hlua tuaj yeem muab faib ua cov cuab yeej plucked (xws li guitar thiab ruan), plucked instruments (xws li violin thiab huqin), thiab cov twj paj nruag percussion (xws li yangqin) hais txog lawv cov lus.
