I had aluminum wire in my first house in the 60's. It is brittle and tends to crack and break where it is connected to the outlets due to plugging and unplugging movement of the receptical. When it cracks, it starts to arc over and can cause fires. Stanwal is right... get rid of it asap.
Aluminum wiring
I recently moved into a house with aluminum wiring and am considering converting over to copper. Is there a benefit to converting for sound quality?