Steven Tyler is a singer-songwriter, multi-instrumentalist, best known as the lead-singer of Aerosmith. He is also the subject of new documentary called "Steven Tyler: Out On a Limb".Steven Tyler is a singer-songwriter, multi-instrumentalist, best known as the lead-singer of Aerosmith. He is also the subject of new documentary called "Steven Tyler: Out On a Limb".Steven Tyler is a singer-songwriter, multi-instrumentalist, best known as the lead-singer of Aerosmith. He is also the subject of new documentary called "Steven Tyler: Out On a Limb".