Musical time is very technical. A composer has to decide whether he wants to follow regular rules for creating a song or whether he wants to make up a new arrangement. Tempo is one choice that affects our perception of time within a song. The composer can change the tempo within a song or keep the same tempo throughout the whole song.
A composer has to decide what tempo he wants to use to decide what speed or pace he wants the piece of work to go. This tempo can therefore either make the song seem like time is passing quicker than it actually is or slower than it actually is. There are many different tempos that a composer can use to complete a song. He can use adagio (very slow), moderato (medium), allegro (fast), or presto (very fast). Depending upon the tempo chosen, the song will sound and feel different. If the composer chooses a faster tempo, the song will seem faster. This would cause an actual minute of musical arrangement to seem as if it were only forty-five seconds. If he chooses a slower tempo then it may seem like the song lasts forever: a minute may seem like a minute and a half.
Therefore, musical time is relevant to the person listening as to whether or not it is fast or slow. This perception of fast or slow relates to the perception of time as well. Depending upon how you feel and perceive the tempo will change your perception of time for those few minutes. This plays a part into why when you are driving a regular route it may seem like sometimes the drive was faster or slower: depending on what songs you are listening to.