friends first listen the song then try it as given .. ^ < ( in whole midis alternate up and down will go on. if u r beginner then try to do it slowly and then faster with the speed of 3/4 ( dont strum/stroke fastly cause that will not make the sound .) D --12 12 13 ( up down little fast) 12 12 15 12 (keep first finger/pointer on 12 fret for whole and try to hammer with middle on 13th fret and with the smallest one i.e pinky on 15 (repeat for 2 or 3 as u wish) D --12 12 12 13 13 13 15 15 15 12 13 15 12 13 12 12 if u will play slowly or in other timing it may sound like nagin or else but try to play it after listening the song enjoy...