Simplify the following text for a Grade 4 native English-speaking person.
Original: It was conceived by vocalist Chris Cornell of Soundgarden as a tribute to his friend , the late Andrew Wood , lead singer of Malfunkshun and Mother Love Bone .
Simplified: He started the band as a tribute to his friend , Andrew Wood . Before he died , Andrew had been the lead singer of Malfunkshun and Mother Love Bone .