A songwriter is a musician who professionally composes musical compositions and writes lyrics for songs. A songwriter can also be called a composer, although the latter term tends to be used mainly for individuals from the classical music genre and film scoring, but is also associated writing and composing the original musical composition or musical bed. A songwriter who mainly writes the lyrics for a song is referred to as lyricist. The pressure from the music industry to produce popular hits means that songwriting is often an activity for which the tasks are distributed between a number of people. For example, a songwriter who excels at writing lyrics might be paired with a songwriter with the task of creating original melodies. Pop songs may be composed by group members from the band or by staff writers – songwriters directly employed by music publishers. Some songwriters serve as their own music publishers, while others have outside publishers. The old-style apprenticeship approach to learning how to write songs is being supplemented by university degrees and college diplomas and "rock schools". Knowledge of modern music technology (sequencers, synthesizers, computer sound editing), songwriting elements and business skills are now often necessary requirements for a songwriter. Several music colleges offer songwriting diplomas and degrees with music business modules. Since songwriting and publishing royalties can be substantial sources of income, particularly if a song becomes a hit record; legally, in the US, songs written after 1934 may be copied only by the authors. The legal power to grant these permissions may be bought, sold or transferred. This is governed by international copyright law. Songwriters can be employed to write either the lyrics or the music directly for or alongside a performing artist, or they present songs to A&R, publishers, agents and managers for consideration. Song pitching can be done on a songwriter's behalf by their publisher or independently using tip sheets like RowFax, the MusicRow publication and SongQuarters. Skills associated with song-writing include entrepreneurism and creativity.