The conjunctive adverb is a special kind of adverb that often serves as a transition between two independent clauses in a sentence. Some common conjunctive adverbs are "therefore," "however," "moreover," "nevertheless," "consequently," and "furthermore." When using a conjunctive adverb at the beginning of the second independent clause, be sure to precede it with a semicolon not a comma.

My roommate usually listens to rock music; however, he also likes John Coltrane and several other jazz musicians.