useless trivia: What Word Means: Choked With Floating Vegetation?

Questions

- Alternative name for trill.?

- A sailors' work song with solo verses (often of an extemporised nature) and chorus matching certain rhythmical movements (e.g. pulling a rope together).?

- A rise in pitch which may be a semitone, or a description of someone singing or playing sharp unintentionally. A double sharp indicates a rising of the pitch by two semitones. ?

- Two melodies moving together in the same direction.?

(It., 'similar') - Indicates that a phrase, etc. is to be performed in the same manner as the previous one.?