"Yesterday" tells a story about four boys growing up in Chicago with dreams of living a worry free life. But before they knew it, these boys turned into street men. Ken and his three friends bonded and made a commitment to the all mighty dollar and soon found out how powerful that can be.They learned that cash can be the root of all evil. For awhile they lived life like a roller coaster ride. Fun, exciting and fast paced with fast cars, beautiful women, and feeling on top of the world. But roller coaster rides end. When it's over, it's over. "FOR EVERY ACTION THERE IS A REACTION." Some learn this the hard way and some learn the easy way. (Thanks to Kiyisha for the roller coaster metaphor.)