mf (meaning medium strength in music) full name mezzo-forte

pp (very weak) pianissimo

p (weak) piano

mp (mid-weak) mezzo-piano

f (strong) forte

ff (very strong) fortissimo

ppp (most Weak)

pppp (very weak)

fff (strongest)

ffff (very strong)

Four-two beats (2 /4), means that in each measure of the following phrase, a quarter note is used as one beat, and each measure has two beats.

The numerator indicates how many beats per measure, and the denominator indicates Beats are divided into fractions of notes.