Simplify the following text for a Grade 6 native English-speaking person.
Original: Adam Noah Levine ( born March 18 , 1979 ) is an American singer-songwriter and musician , best known as the frontman and guitarist for the rock band Maroon 5 .
Simplified: Adam Noah Levine ( born March 18 , 1979 ) is the lead singer of American pop-rock band Maroon 5 . He is also a songwriter and guitarist .