By Sue Zeidler LOS ANGELES (Reuters) - After 40 years with one of the biggest rock bands in the United States, Aerosmith frontman Steven Tyler and guitarist Joe Perry are finally being honored for their songwriting. The duo, dubbed the Toxic Twins in their drug-fueled early years, co-wrote many of the bands' biggest hits like "Walk This Way" and "Back in the Saddle," which catapulted Aerosmith to fame in the mid-1970s. ...