 " Umbrella " is a pop and R & B song . The song 's musicscape is based on the hi @-@ hat , synthesizers , and a distorted bassline . According to Entertainment Weekly magazine , the song 's beat can be recreated through a drum loop from the Apple music @-@ software program GarageBand ( Vintage Funk Kit 03 ) . The song is written in the key of B ♭ minor . The song 's lyrics are written in the traditional verse @-@ chorus form . They open with a rap verse , and the hook " ella , ella " follows every chorus . A bridge follows the second hook , and the song ends in a fadeout . 
