Darlington-pair transistor power amplifier for cd-player
To protect against possible future edits, here is the circuit we are talking about:



This circuit is a joke.  With no input, the transistor will be saturated and the collector voltage will be as low as it can go.  The negative-going parts of the input signal will turn off the transistor, which then allows R3 to pull the collector high very weakly.  You now essentially have a 20 V transient applied to a 8 &Omega; speaker thru a 100 k&Omega; resistor.  You will probably be able to hear something if you put your ear up to the speaker.

Forget about this mess and move on.  Trying to fix this would really be designing a proper circuit from scratch, with vague specs.

What to do next depends on your real purpose, which is not clear.  In one place you way you want to use a single transistor for some reason, but in another it seems you just want a audio power amp for a "CD player", which probably means it will take normal line level audio signals in.

Decide the one thing you really want to do and ask another question about that.  Include specs on what the input signal will be like, how much output power the amp should be capable of, etc.  However, leave any assumed implementation out.  If you knew how to do this, you wouldn't be here asking.