Table: lyfe_discography
Columns: year
song
u_s_hot_100
u_s_r_b
u_s_hot_adult_cont
album

Question: Which song has a U.S. R&B 100 in 2010?
SQL: SELECT "song" FROM lyfe_discography WHERE "year" = 2010 AND "u_s_r_b" = '100'