Simplify the following text for a Grade 11 native English-speaking person.
Original: The river is now internationally famous thanks to the music of the 1960s known as Merseybeat and its strong association with Liverpool , which produced songs such as Ferry Cross the Mersey .
Simplified: The river is now internationally famous thanks to the music of the 1960s known as Merseybeat from the Mersey Sound and its strong association with Liverpool .