The lineup for Eric Clapton's Crossroads Festival was already loaded with top notch players. Keith Richards made the already special showcase of guitar greats got even better Friday (4/12) at Madison Square Garden when the Rolling Stones guitarist joined the EC on stage. The pair traded licks on y Keys To The Highway and Sweet Little Rock 'n Roller. Later in his set, Slowhand was joined by Robbie Robertson on I Shall Be Released. The nearly 5 hour concert also saw the host perform with Robert Cray, and Los Lobos. Gregg Allman put in an appearance with Warren Haynes & Derek Trucks and Gary Clark Jr. and Jeff Beck brought the house to its feet with great sets.