Which abbreviation indicates medium loud-a little louder than mp, and half as loud as forte?

pp

p

f

ff

mf

The correct option is E.

In music dynamics, letter P is used to represent softness while letter F is used to represent loudness. Letter M can be added to P to create MP, which stands for moderately soft. Letter M can also be added to F to create MF, which stands for moderately loud.

It's mf, which stands for "mezzo forte".