The openong bars on any song-not just rap- are the most important part, next to the beat. If your opening line is weak, expect to get turned off by Esco. Anyways, these are my 3 favorite opening bars of all time.
1. Jay-Z, PSA - "Allow me to re-intoduce myself, My name is Hov' (oh) H to the O-V I used to move snowflakes by the O-Z I guess even back then you could call me the CEO of the ROC"
2. Kanye West, Drive Slow-"My homey Mali used to stay 79th and May, one of best friends from back in the day"
3. Ludacris, Grew Up a Screw Up- "Ever since I was an embryo, ready to shape up and ship out, something in my brain said wake up and kick out"
And now enter the criticism for not having Dre, Biggie, Rakim, Nas, Tupac, Lil Wayne, Eminem, Snoop, etc.