and brass sections used in a standard orchestras to electronic instruments such as synthesizers. Some common group settings include music for full orchestra (consisting of strings, woodwinds, brass, and percussion), concert band (which consists of larger sections and greater diversity of woodwind, brass, and percussion instruments than are usually found in the orchestra), or a chamber group (a small number of instruments, but at least two). The composer may also choose to write for only one instrument, in which case this is called a solo. Solos may be unaccompanied, as with works for solo piano or solo cello, or solos may be accompanied by another instrument or by an ensemble. Composers are not limited to writing only for instruments, they may also decide to write for voice (including choral works, some symphonies, operas, and musicals). Composers can also write for percussion instruments or electronic instruments. Alternatively, as is the case with musique concrète, the composer can work with many sounds often not associated with the creation of music, such as typewriters, sirens, and so forth. In Elizabeth Swados' Listening Out Loud, she explains how a composer must know the full capabilities of each instrument and how they must complement each other, not compete. She gives an example of how in an earlier composition of hers, she had the tuba playing with the piccolo. This would clearly drown the piccolo out. Each instrument chosen to be in a piece must have a reason for being there that adds to what the composer is trying to convey within the work. Arranging Arranging is composition which employs prior material so as to comment upon it such as in mash-ups and various contemporary classical works. Interpretation Even when music is notated relatively precisely, as in Western classical music from the 1750s onwards, there are many decisions that a performer or conductor has to make, because notation does not specify all of the elements of musical performance. The process of deciding how to perform music that has been previously composed and notated is termed "interpretation." Different performers' or conductor's interpretations of the same work of music can vary widely, in terms of the tempos that are chosen and the playing or singing style or phrasing of the melodies. Composers and songwriters who present their own music in a concert are interpreting their songs, just as much as those who perform the music of others. The