Blues can be categorized into a number of genres. There are also genres of music that are not blues but which can be described as blues-like or bluesy. What may also be called blues is the actual chord structure of a piece, which goes through a standard chord progression, called the blues chord progression, containing the 3 basics chords: I, IV and V, which means the first, the fourth and the fifth degree.
Alternative country (sometimes alt-country, insurgent country, or Americana) is a loosely defined subgenre of country music, which includes acts that differ significantly in style from mainstream country music and pop country music. Alternative country artists are often influenced by alternative rock.