Concept album

Usually, in popular music, an album of an artist or group simply consists of a number of songs that the members of the group or the artist have written or have chosen to cover. In a concept album, on the other hand, all songs are considered a single unity, and have purposefully been composed to belong together. The album Sgt. Pepper's Lonely Hearts Club Band of the Beatles is frequently considered to have been the first concept album, primarily because the title song, occuring in two versions, wraps around the rest of the album like bookends; however, most of the songs on that album are actually unrelated to one another.

Other famous concept albums include:

• The Wall - Pink Floyd
• Misplaced Childhood - Marillion
• Bat out of hell - Meat Loaf
• Tommy - The Who
• Days of Future Passed - Moody Blues
• Tales of Mystery and Imagination - Alan Parsons Project
• I, Robot - Alan Parsons Project
• Welcome to My Nightmare - Alice Cooper
• Tales from Topographic Oceans - Yes
• The Lamb Lies Down on Broadway - Genesis