Drink can dealers often purchase aluminium cans in bulk, even when deposits are not offered. Aluminium is one of the most cost-effective materials to recycle. When recycled without other metals being mixed in, the can–lid combination is perfect for producing new stock for the main part of the can—the loss of magnesium during melting is made up for by the high magnesium content of the lid. Also, reducing ores such as bauxite into aluminium requires large amounts of electricity, making recycling cheaper than producing new metal. Aluminium cans are coated internally to protect the aluminium from oxidizing. Despite this coating, trace amounts
You Are What You Is Harris adding overdubs and joining the group for Zappa's fall 1980 tour. However, "You Are What You Is" was not released until after "Tinseltown Rebellion" and "Shut Up 'N Play Yer Guitar" although the latter two albums included material from the fall tour. The album also included guest appearances from former band members, including Jimmy Carl Black and Motorhead Sherwood from the 60's Mothers of Invention, as well as the first appearances on record of Zappa's children Moon Unit and Ahmet. Like many of Zappa's albums, some of the tracks are bound together, and the album lacks an overall storyline.