During my two visits to Tanzania, I enjoyed reading the Street ads and Public notices in Swahili language . It is written using the English alphabets. In almost every sentence, you find one or two Arabic words. Hence, the overall meaning is concluded.
I took this photo of a tanker in Dar EsSalam. The words on the back says: Maji Safi which has the same meaning in Arabic an Ma'a Safi. Wizara e Fida are two Arabic names for Wizarat Al Fida meaning Ministry of Silver (ie Ministry of Finance).
The influence is even greater in Zinjibar. The Music played on Al Qanoon is very similar to our melodies and musical rythms of Hijaz, Biati etc. What a nice country and lovely people.