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I start as hanging carpets part

One ends and calls the second starts

My tune extravagant and brassy,

See my business, dress up classy,

For your treat has just begun;

Don't move, but have me run.

'So, are you two?'
'Not two, one with two ends.'
'One start and two ends?'
'Don't be ridiculous, one end and one end that starts.'

Riddle Answer A Show

Riddle Explanation

my tune extravagant and brassy - a show tune.

see my business, dress up classy - show business.

for your treat has just begun; don't move, but have me run - to run the show.