Even when music is notated relatively precisely, as in music, a performer must make many decisions because the notation does not specify all elements of the music. The process of deciding how to perform music that has been previously composed and notated is called "interpretation". Interpretations of the same piece of music by different performers can be very different in terms of the tempos chosen, the style of playing or singing, or the phrasing of the melodies. Composers and songwriters who perform their own music interpret their songs in the same way as those who perform the music of others. The standard choices and techniques available at a particular time and place are referred to as performance practice, while interpretation generally refers to the individual choices of a performer.