(From Wikipedia) Shaabi (Egyptian Arabic: شعبي‎ Shaʻbī pronounced ) is an Egyptian musical genre. It is a form of popular working-class music that evolved from baladi in the second half of the 20th century.

(Different source) Shaabi comes from the Arabic word for “people,” and the term refers to the culture of the common man and the street. Shaabi songs are sung in colloquial Arabic — the everyday spoken language, not the classical Arabic mastered by Egypt’s great midcentury diva Oum Kalthoum. In Cairo, you can hear a syncopated shaabi rhythm called the maqsoom thumping out of microbuses, taxi cabs, tuk-tuks (Auto rickshaw), and Nile party boats. The songs play a central role in wedding parties