he musical stylings of Erick Strickland left much to be desired, but the lyrics were pitch perfect. ''Rejuvenation is what I need, re-ju-ven-a-tion, re-ju-ven-a-tion,'' sang Strickland to a tune sounding like a cross between ''Satisfaction'' by the Rolling Stones and ''Celebration'' by Kool and the Gang. Despite the Celtics being blown out by Sacramento, Strickland was full of song Wednesday night in anticipation of a four-day respite.