Smule Collabs: Duets, Groups, and Invite Extensions Explained
Collaboration is the heart of what makes Smule different from a standard karaoke app. This guide covers everything about how the collab system works — from basic duets through group recordings, invite extensions, and the often-misunderstood option to turn a join into your own invite.
How joins work
Every song on Smule can be recorded as a solo or as one half of a duet. When you record your part and leave the recording open, it appears in the feed as an open invite — any other user can tap to join, record the second part, and publish the combined recording.
When someone joins your invite, Smule blends both vocal recordings together in real time on the joining singer's device. The result is a single mixed recording featuring both voices — it appears on both profiles and in both singers' feeds. Neither person has to be online at the same time for this to work.
Invite extensions
Invite extensions are one of Smule's less obvious but genuinely useful features. They let you add additional parts to an existing collab — so a duet can become a trio, quartet, or larger ensemble recording without everyone needing to be part of the original session.
To add an extension: open a published collab and look for the option to add an extension part. You record a new vocal layer that gets added alongside the existing mix. Extensions are particularly popular in the harmony and choir communities on Smule, where singers build up layered arrangements one part at a time.
Full details on how extensions work in different recording contexts are covered in Smule's invite extensions help article.
Turn a join into your own invite
One of the most useful — and most overlooked — features in Smule is the ability to turn a join into your own invite. Here's what that means:
When you join someone else's open invite, you normally publish the completed duet as a collab between you and the original poster. But you can also choose to flip this — record your part and post it as your open invite, with your vocal as the primary part and an open slot for someone else to join.
This is especially useful when you hear a great backing vocal from another user that you want to use as a foundation, or when you want to create your own invite for a song without recording the first part from scratch. See Smule's official help article for the current step-by-step in the latest app version.
Group recordings
Groups extend the collab system beyond duets. A group recording can include multiple singers contributing separate parts, all blended into a single finished mix. Groups work through Smule's Groups feature, where members can coordinate recordings, communicate, and post to a shared space.
How group recordings work
One singer starts the recording and posts their part. Other group members can then join and add their parts sequentially. Smule blends all the vocals together. Unlike a duet, you're not limited to two parts — groups can layer multiple voices, making them popular for choirs, harmony groups, and friend collectives.
Group management
Groups have their own management features — you can control who can join, manage notifications, and coordinate which songs to record together. Group admins have additional controls over membership and content. Full details are on Smule's group management help page.
Collab etiquette
Smule's collab community has informal but widely observed norms. Following them makes you a better collab partner and tends to result in more people wanting to record with you.
Respond to joins
When someone joins your invite, acknowledge it — a comment, a like, or a return collab request are all common. Ignoring completed joins is noticed and tends to discourage future collaborations.
Don't leave invites hanging indefinitely
If you post an open invite and someone joins it quickly, try to listen to their version and respond. An invite that gets completed and then silently ignored doesn't encourage the joiner to keep engaging with your content.
Quality matches quality
If you're joining a well-produced, clearly thoughtful recording, bring the same care to your part. A low-effort join on a high-effort invite is jarring and tends to reflect poorly on the finished recording — which both names are now attached to.
Let songs finish
For video collabs specifically — don't step away or cut the recording early just because your vocal part is done. Stay present until the song ends. See our video guide for more on this.
Open vs. closed recordings
When you publish any recording on Smule, you can choose whether to leave it open (joinable by anyone) or closed (no joins accepted). A few considerations:
Leave it open by default. Open recordings distribute themselves through the join mechanic — anyone who completes your invite brings their audience to your recording. There's very little downside to leaving recordings open unless you have a specific reason not to.
Close it if the collab is complete. If you've already recorded a duet with someone specific and don't want random joins altering the character of the recording, close it after the collab is done.
You can change it later. Open invites can be closed after posting, and vice versa. You're not locked into the decision at publish time.