The great Francisco Tarrega was important for the classical guitar because he set the modern school and wrote many songs and didactic works of various levels of difficulty. For example this Vals in D Major is a piece of intermediate difficulty, suitable for those who already have a basic knowledge on classical guitar.
Music and Awareness
Vals in D Major, Francisco Tárrega – Free Guitar Score
Vals in D Major, Francisco Tárrega – Free Guitar Tab
Francisco Tárrega – Wikipedia