Bain Capital Partners LLC completed its $2.1 billion purchase of music instrument retailer Guitar Center on Tuesday, squelching early speculation that the deal might go sour.

As a result of the deal’s close, Guitar Center will become a private company. Tuesday was the last day its shares were traded on the Nasdaq and closed up 6 cents to $62.87.

At times since Guitar Center agreed in June to be acquired by the Boston-based private equity firm, shares were trading nearly 10 percent below Bain’s $63-per-share offer – an especially wide gap, leading to doubt about the successful close of the deal.

But at the beginning of October, Guitar Center stock price rose to its highest in almost two years as investors began to believe that the deal was going to be completed. Bain would have had to pay $58 million to walk away.