Case Update: Solar Drops Second Gang Starr Lawsuit After Judge Questions Prospect of Duplicative Litigation

When I first wrote about the latest chapter in the legal battle surrounding Gang Starr in September 2025, producer John Mosher, professionally known as Solar, had filed a new federal lawsuit against DJ Premier and others only months after losing an earlier case involving many of the same underlying rights.

That second lawsuit is now over.

And the way it ended is worth noting.

A Brief Recap

In June 2025, Mosher filed Mosher v. Martin, No. 7:25-cv-05207, in the Southern District of New York. The defendants included Christopher Martin, better known as DJ Premier, along with Guru Productions, Inc., Ill Kid Music, Inc., and others.

The lawsuit followed Mosher’s earlier case, Mosher v. Veyda, No. 7:22-cv-09632, in which Judge Cathy Seibel dismissed his principal copyright and trademark claims with prejudice in December 2024.

As I discussed in my original article, the new lawsuit raised an obvious question: how much room remained for Mosher to pursue another case arising from his asserted rights in Gang Starr-related intellectual property after the earlier dismissal?

By late 2025, the court was asking similar questions.

The Court Gives Mosher an Opportunity to Amend

In September 2025, Guru Productions and Ill Kid Music sought leave to move to dismiss the new lawsuit.

Following an October 14, 2025 pre-motion conference, Judge Seibel gave Mosher an opportunity to amend his complaint rather than immediately proceeding with the contemplated dismissal motion.

His amended complaint was due November 13.

Mosher did not file one.

Instead, he asked the court to dismiss the case without prejudice under Federal Rule of Civil Procedure 41(a)(2). According to the court’s subsequent order, Mosher explained that he wanted to pursue an alternative resolution and potentially bring a more streamlined lawsuit containing claims that he believed were not precluded by the earlier litigation.

Judge Seibel was not persuaded.

Judge Seibel Calls the Proposed Path Forward “Puzzling”

In a November 22, 2025 order, Judge Seibel denied Mosher’s request for a court-ordered dismissal without prejudice and without fees or costs.

The court found several factors weighing against the request, including what it described as:

“undue vexatiousness,” “the duplicative expense of relitigation which Plaintiff apparently contemplates,” and “the inadequacy of Plaintiff’s explanation, which does not make much sense.”

The court also characterized Mosher’s explanation as “puzzling.”

Why?

Because the court had already given Mosher an opportunity to file an amended complaint in the existing case. If he believed he had viable claims that survived the earlier litigation, he could have attempted to plead them there.

Instead, his proposed course appeared to contemplate dismissing the pending case and potentially starting over again.

Judge Seibel declined to approve that approach on the terms Mosher requested.

Mosher Ultimately Dismisses the Case Himself

The court gave Mosher several options, including proceeding with an amended complaint or taking whatever action remained available to him under Rule 41.

Mosher ultimately chose the latter.

On December 6, 2025, he filed a notice of voluntary dismissal under Federal Rule of Civil Procedure 41(a)(1)(A)(i), dismissing the action without prejudice.

The case was terminated shortly afterward.

A dismissal without prejudice generally means the dismissal itself does not operate as an adjudication on the merits of the claims asserted in that particular action. But here, the procedural history matters.

Mosher’s earlier lawsuit had already resulted in the dismissal with prejudice of significant copyright and trademark claims. And in the second case, the court expressly raised concerns about duplicative litigation before Mosher voluntarily dismissed it.

The Earlier Appeal Is Over Too

There has also been a development in Mosher’s first case.

Mosher appealed the December 2024 judgment in Mosher v. Veyda to the U.S. Court of Appeals for the Second Circuit.

That appeal was dismissed on January 21, 2026.

As a result, the December 2024 judgment dismissing the claims at issue in that case with prejudice remains in place.

Where Things Stand

For now, both federal cases are finished.

The first ended with a dismissal with prejudice of Mosher’s principal trademark and copyright claims, followed by the dismissal of his appeal.

The second ended voluntarily, but only after Judge Seibel questioned Mosher’s explanation for seeking dismissal and specifically identified concerns about vexatiousness and the potential expense of duplicative litigation.

That distinction is important.

The court did not enter a merits judgment against Mosher in the second action. At the same time, the procedural history makes clear that any future effort to revive substantially overlapping claims would have to contend with the earlier judgment and the preclusion issues that prompted questions about the second lawsuit in the first place.

For a dispute that has already produced years of litigation over the rights surrounding Gang Starr, the latest development may finally represent something closer to an ending.

Whether it is the final one remains to be seen.