Attorneys for Hall & Oates members Daryl Hall and John Oates clashed in a Nashville courtroom Thursday during the first showdown in an increasingly bitter lawsuit between the longtime musical partners.

At a live hearing in Davidson County Chancery Court, a who’s-who of music litigators battled over whether Hall was entitled to an order extending an existing restraining order that’s been blocking Oates from selling his share of their joint venture to industry heavyweight Primary Wave.

Representing Hall was Christine Lepera of the law firm Mitchell Silberberg & Knupp, who argued that it would be “most efficient” to issue a court order putting the sale on ice until a private arbitrator can hear the case and decide whether Oates was legally allowed to sell his stake to Primary Wave.

Firing back for Oates was Derek Crownover from the firm Loeb & Loeb LLP, who said that no additional injunction was needed — that Hall was “not entitled to any relief at all” — and the dispute should simply be allowed to play out in arbitration. Crownover said that at most, the judge should extend the restraining order by only a few weeks.

At the end of the hearing, the judge overseeing the dispute, Chancellor Russell Perkins, said he would issue a ruling later on Thursday on whether he would extend the restraining order.

Hall & Oates pumped out six chart-topping singles and four chart-topping albums during the 1970s and 1980s, and continued to successfully tour as recently as last year. But in early November, Hall filed a private arbitration case against Oates, accusing him of violating their partnership agreement by attempting to sell his half to Primary Wave, a prominent music company that’s purchased catalogs and other IP linked to many iconic musicians in recent years.

Fearing the deal would close before the arbitration case was heard, Hall then filed the current lawsuit in Tennessee, seeking a court order to block the sale. The case was filed under seal, shrouding it in mystery and leading to days of speculation about why the beloved singers were suing each other. The judge overseeing the case quickly issued a temporary restraining order, blocking the Primary Wave sale from closing until Thursday’s hearing could be held.

The live hearing came just hours after Hall and Oates directly attacked each other for the first time in court filings.

In a sworn statement on Wednesday, Hall said he had been “blindsided” by the Primary Wave deal and called it the “ultimate partnership betrayal” by his former partner. “Respectfully, he must be stopped from this latest wrongdoing and his malicious conduct reined in once and for all,” Hall wrote of Oates.

Hours later, Oates said in his own declaration he was “tremendously disappointed” about that Hall would make such “inflammatory, outlandish, and inaccurate statements” about him. “I can only say that Daryl’s accusations that I breached our agreement, went ‘behind’ his back, ‘acted in bad faith,’ and the like, are not true,” Oates wrote.