When independent songwriters first look into PROs, they usually find four US names: ASCAP, BMI, SESAC, and GMR. The first two accept applications from any eligible writer; the second two work differently. SESAC and GMR operate on an invitation basis, which makes them a different kind of option for most independent artists. This guide explains what these two organizations are, what “invite-only” actually means in practice, and how to think about them relative to the PROs you can simply join. To compare the organizations side by side, use the PRO Comparison calculator.

The two groups of US PROs

It helps to picture the four US PROs as two groups:

  • ASCAP and BMI are the large, long-established organizations open to independent songwriters. For most indie writers, the real day-one choice is between these two, as covered in ASCAP vs. BMI.
  • SESAC and GMR are smaller and operate selectively, generally by invitation rather than open enrollment.

All four perform the same core function — collecting performance royalties on compositions — which we explain in what is a performing rights organization. The difference is not what they do, but who can join and how.

What “invitation-only” means

Open PROs let you apply and affiliate on your own initiative once you meet eligibility requirements. Invitation-based PROs flip that: rather than you signing up, the organization extends membership to writers and catalogs it chooses to represent. In practical terms, that means a writer typically becomes a SESAC or GMR affiliate because the organization approached them or accepted them through a more selective process, not because they filled out a public application form.

For an independent artist just starting out, the implication is simple: you generally cannot decide today to join SESAC or GMR the way you can decide to join ASCAP or BMI. That is not a judgment about your music; it is just how these organizations are structured.

Why these organizations exist

Even though most independent artists will not join them early on, it is worth understanding why invitation-based PROs exist at all. A more selective model lets these organizations operate with a curated roster and a different service posture than the large open PROs. They still collect performance royalties on compositions, still license music users, and still pay writers and publishers — the function is the same as any PRO. They simply build their membership differently. None of this changes the fundamentals of performance royalties; it changes the front door.

What this means for your decision

If you are an independent artist deciding where to affiliate, the honest takeaway is:

  • Your realistic choice is usually ASCAP or BMI, because they are open to you and SESAC and GMR generally are not unless invited.
  • Do not wait around hoping for an invitation before getting set up. Performance royalties accrue whether or not you are collecting them, so the priority is to affiliate somewhere and register your works. See do I need to join a PRO.
  • Focus on what you can control: choosing an open PRO that fits your structure and goals, and registering your works correctly so you actually get paid.

In other words, SESAC and GMR are useful to understand, but for most independent writers they are not the decision in front of you right now.

Confirming current terms

Because the policies, eligibility, and joining processes of all PROs can change over time, treat any specific claim about how SESAC or GMR operate — including how one might come to be invited — as something to verify directly with the organization rather than from secondhand sources. The same caution applies to fees and terms at any PRO: confirm the current details on the organization’s own materials. The PRO Comparison calculator is built to help you line up the considerations across organizations as you research.

How they fit the bigger picture

Whichever PRO you eventually affiliate with, remember that a PRO only covers performance royalties on your compositions. The mechanical and master sides are handled by other bodies, and international and publisher-share collection often need an administrator. That broader map is the same regardless of which of the four US PROs is involved, and we cover it across the rest of this section and in the original ASCAP/BMI/SESAC overview. Understanding SESAC and GMR mainly helps you recognize why they are not your starting point — and lets you make an informed choice among the PROs that are.

Frequently asked questions

Can I just sign up for SESAC or GMR as a new artist? Generally no. Both operate on an invitation basis rather than open enrollment, so most independent artists start with an open PRO like ASCAP or BMI.

Are SESAC and GMR better than ASCAP or BMI? “Better” is not the right frame. They perform the same core function as any PRO; they differ mainly in their selective membership model. For most independent writers, the open PROs are the realistic choice.

Do SESAC and GMR collect the same kinds of royalties? Yes, as PROs they collect performance royalties on compositions, license music users, and pay writers and publishers. The royalty type is the same; the membership process is what differs.

Should I wait to be invited before joining any PRO? No. Performance royalties accrue whether or not you collect them, so it is better to affiliate with an open PRO and register your works now rather than wait for an invitation that may never come.

Where can I confirm how these organizations work? Treat specific claims about their processes, terms, or fees as something to verify directly with the organization, since policies change. Use the PRO Comparison calculator to organize your research.

Estimates are for informational purposes only and are not financial, investment, tax, or legal advice. For a range based on your own numbers, try the PRO Comparison calculator.