Simplify the following text for a Grade 10 native English-speaking person.
Original: Considered one of the most popular Brazilian cultural expressions , samba has become an icon of Brazilian national identity . The Bahian roda de samba ( dance circle ) , which became a UNESCO Heritage of Humanity in 2005 , is the main root of the samba carioca , the samba that is played and danced in Rio de Janeiro .
Simplified: Traditional Brazilian samba includes the samba which is danced solo at Carnival .