Please explain me "chal" and "Achal" swar

Chal swar CHALAYMAAN hotel hai

Aur Achal swar ACHALAYMAAN

Yani ki Chal Swar Apni Jagah Badal SAKTE Hai Par Achal Swar Ek Jagah Atal Rehte H Matlab Vo Apni Jagah Se Nahi Hilte

Uttar Bhartiye Sangeet Mai SA Aur PA Ko Achal Swar Mana Gya Hai

Mujhe jitna Pata tha Maine Bata Diya

Ho Skta Hai Kuch Upar Niche Maine Bataya Ho To Mujhe Maaf KR Dena

Thanks

ISHANT SONI😇

(LITTLE FLUTIST)