A perfect example of surf music is the song "wipeout". Surf music is often upbeat and in a major key to reflect the hot sunny weather that makes surfing more idyllic. It needs to be fairly uptempo and is often instrumental with a guitar melody being the main focus. The guitar will often have a reverb effect too.
Country!!
bluegrass
People of the Bluegrass Roots played the guitar, banjo, and violin.
van morrison and his backup singers
The musical style dependent on frequently changing arrangements of simple tunes is called improvisation. This allows musicians to add their own personal style to a pieces.
Jazz (apex final exam)
rock