Yes, you need a license from COSOTA before you can use any music whether local or foreign. The principle of National Treatment for works protected by copyright as enshrined in the Berne Convention which Tanzania is a signatory to, COSOTA is obliged to treat foreign works the same way it treats national works. COSOTA is also a member of the International Confedaration of Societies of Authors and Composers (CISAC) which has rules on the treatment of the authors and composers.