The typical Conventions that make a genre is :
- instruments used
-sound/tempo/volume/style of singing
-context/themes of songs
-appearance of the artist
Let's apply this to a few different types of genres:
Pop- Generally applies to teenagers; a bland watered down version of rock n roll with more rhythmic and harmony and an emphasis on romantic love but still very upbeat and over the top. Artist tend to wear modern stylish clothing featured over the top dramatic bright clothing. They normally express a vibe of being happy and content with life and this has an influence on their audience. The sound of the music is normally studio produced.
Rock-originating in the 1950s; a blend of country and western with black rhythm and blues;rock is a generic term for the range of styles that evolved out of rock n roll. The song normally featured a heavy solo in the middle section, and the lyrics tend to be based around sex, love and drugs. They tend to wear leather and black clothing; something that isn't mainstream. The sound is normally created by the band itself featuring drums,bass etc.