Andante maestoso is typically used for pieces of music that are intended to be performed in a grand or impressive manner. It is often found in orchestral works, such as symphonies and concertos. It is also sometimes used in choral music, particularly in hymns and anthems.
When a piece of music is marked andante maestoso, the conductor will typically take the tempo to be between 76 and 80 beats per minute. However, the exact tempo may vary depending on the piece of music and the interpretation of the conductor.