Learn English – What would you call a avid music lover who listen to all kind of music which are usually top of the chart

Perhaps a canopy?

2. Architecture An ornamental rooflike projection over a niche, altar, or tomb.
3. A protective rooflike covering, often of canvas, mounted on a frame over a walkway or door.

Or an awning?

A rooflike structure, often made of canvas or plastic, that serves as a shelter, as over a storefront, window, door, or deck.

A term that has laudatory connotations is language maven. Wikipedia defines maven as follows:

A maven (also mavin) is a trusted expert in a particular field, who seeks to pass knowledge on to others. The word maven comes from Hebrew, meaning "one who understands", based on an accumulation of knowledge.

As Wikipedia further notes:

Since the 1980s it (maven) has become more common since William Safire adopted it to describe himself as "the language maven". The word is mainly confined to American English, but did not appear with the publication of the 1976 edition of Webster's Third New International Dictionary; it is, however, included in the Oxford English Dictionary second edition (1989) and the American Heritage Dictionary fourth edition (2000). Numerous individuals and entities now affix maven or mavin to assert their expertise in a particular area.

The following is an extract from The New York Times, the newspaper in which Safire wrote a regular column about language issues (called On Language) until his death in 2009:

Though he jokingly anointed himself “Usage Dictator,” he was never comfortable with expectations that he play the part of language absolutist, handing down infallible decrees. “Maven” was a title more to his liking, a Yiddishism that he said contained its own “note of self-mockery.” (An incurable paronomasiac, he also enjoyed punning off the word, as in his 1993 collection of columns, “Quoth the Maven.”)

And further:

As battles raged between prescriptive grammarians and descriptive linguists and lexicographers, Safire more often than not played both sides against the middle.

Note: The On Language articles in The New York Times were continued for a while by maven Ben Zimmer, who is also a regular contributor to Language Log.