The 'Great Courses' company in America has a wide range of courses available on DVD or to stream. Most months some courses are significantly reduced in price and represent wonderful value for money. To go to their UK website click here.

They state what looks to be a rather generous return/replacement policy and lifetime guarantee.

The following give some idea of their wide range of music appreciation courses.

Bach and the High Baroque

Beethoven's Piano Sonatas

Chamber Music of Mozart

Concert Masterworks

Elements of Jazz: From Cakewalks to Fusion

Great American Music: Broadway Musicals

Great Masters: Beethoven and Mahler—Their Lives and Music (Set)

Great Masters: Beethoven—His Life and Music

Great Masters: Brahms and Liszt - Their Lives and Music (Set)

Great Masters: Brahms—His Life and Music

Great Masters: Haydn, Mozart, Tchaikovsky, and Stravinsky—Their Lives and Music (Set)

Great Masters: Haydn—His Life and Music

Great Masters: Liszt—His Life and Music

Great Masters: Mahler—His Life and Music

Great Masters: Mozart—His Life and Music

Great Masters: Robert and Clara Schumann and Shostakovich — Their Lives and Music (Set)

Great Masters: Robert and Clara Schumann—Their Lives and Music

Great Masters: Shostakovich—His Life and Music

Great Masters: Stravinsky—His Life and Music

Great Masters: Tchaikovsky—His Life and Music

How to Listen to and Understand Great Music, 3rd Edition

How to Listen to and Understand Opera

Life and Operas of Verdi

Operas of Mozart

Symphonies of Beethoven

The Concerto

The Symphony

The Symphony & How to Listen to and Understand Great Music (Set)

Understanding the Fundamentals of Music