The band

Their music matured as time passed. First they were using simple chord progression ,cheesy lines, easily singable . They also encouraged each other to sing and perform.  

In the end, they used wild chord progression, their playing in instrument also speeded up. They learned new styles like blues and used it. They also stopped encouraging and promoted themselves . They put hands on other band members to move them back so he could sing. 

Their physical appearances also changed radically. Initially they were thin , had less expensive dresses except for Paul who was rich and wore good tees. Their hair were also normal. Then they started using leather jackets and jeans. Lenon wore colorful eye shades. The drummer always wore baniyan . Their hair grew. Pauls hair was still old. Some of them pony - tailed. They didn't had moustache.  

In the end, they had moustache, beard. They were fatter.