Wedding March
The "Wedding March" was a piece of classical music for an adaptation of William Shakespeare's A Midsummer Night's Dream.

When the biomemetic doubles of Tom Paris and B'Elanna Torres were married in 2375, Harry Kim played the tune on his clarinet, accompanied by two  crew members playing the double bass and the guitar after the wedding ceremony. ()

External link 
 

fr:Ein Sommernachtstraum
Earth musical compositions