Programs may be influenced by the available ensemble of instruments, by performer ability or skill, by theme (historical, programmatic, or technical), by musical concerns (such as form), or by allowable time.
The structure of modern concert programs can be traced back to the contributions of Felix Mendelssohn while he was director of the Gewandhausorchester in Leipzig.
Also provided, if necessary, is information about the conductor and performers of the ensembles, and especially featured soloists.
With the presentation of contemporary pieces, it is common to include notes provided by the composer.
Program notes may include information about, and quotes or commentary from, the composer, conductor, or performers, as well as provide context regarding the musical era.