Simplify the following text for a Grade 10 native English-speaking person.
Original: During the 1960s , some samba groups appeared and were formed by previous experiences with the world of samba and songs recorded by great names of Brazilian music .
Simplified: There are two major streams of samba that differ considerably : the modern ballroom samba , and the traditional samba of Brazil . Traditional Brazilian samba includes the samba which is danced solo at Carnival .