TUI Cruises, the Hamburg based premium market company, says it will host a musical festival at sea during a four night cruise from Hamburg to Kiel via Copenhagen and Oslo, which will sail on 27 August. There will be 13 artists and bands on board Mein Schiff 1 on the cruise, which will offer about 30 concerts, meets and greets, workshops, films, lectures and other music themed activities, the company said in a statement.