Conventions of a Genre - Hip Hop/Rap

The typical traits of hip hop and rap range but they are usually linked with money. Typically black people are rappers, for example 50 Cent, and very rarely are there white rappers eg Eminem.
A main convention is bling. This jewellery basically shows they have a lot of money and that they don't mind spending their cash. Here is 50 Cent:

Another one is cars. This convention also relates to wealth as this is used for many situations in rap music videos, but it is usually the artist pulling up at a club arriving at a party in style. The Hummer is the typical car normally used in these music video:

If rappers have a song alongside a singer then bling is not the main focus. Whereas rappers have close ups on their bling and cars, the singer does not have much of a focus on that but more close ups on their face. With Snoop Dogg featuring Justin Timberlake - Signs (2005), Snoop Dogg is carrying out the usual conventions for this genre, eg cars, women and money, however, Justin Timberlake is dancing as opposed to flashing bling and a convertible Mercedes.
He even has his own hand movents while dancing, which could be a way of connecting with the audience, and could possibly be copied by them when they are dancing themselves, and this could be a USP, or a way of distinguishing this song from another.