What a happy little budgie!! I noticed you have two wooden dowels in the cage. I'd recommend swapping these out for natural perches to aid in exercise and circulation in the feet as well as preventing bumble foot and pressure sores. Take a look through the Essentials to a great cage sticky
I'd also love to see some close up pics of disco, his colour looks really nice and bright My budgies started chirping along while I watched this video!