TAMBR

A casting call for songs

You post the song and say what it is missing. We show you people who could play it, one at a time, with their sound already playing. Swipe right and that is a real offer with real money or real points on it. They swipe back and the paperwork signs itself.

you never swipe on a person. you swipe on a person against a brief.

See the 22 screens How the money works
TAMBR 400TX · FR 08A · THE CONTACT SHEET
The contact sheet: casting for Golden, needs horns
15 casts per call
86×
Producers listed per horn player on SoundBetter. The scarce side is not who you think
0.58
Gini coefficient of Tinder likes. More unequal than 95% of world incomes
$400M
Paid out by BeatStars. Musicians will transact when terms are clear
<$3M
Vampr sold for this with 1.4M users, because it stopped at the introduction
The one structural idea

A right swipe is an offer, not a like

That single change fixes what kills every swipe marketplace. Rank by relevance to this song instead of global popularity, cap the caster at fifteen swipes per call, and make the swipe carry money. The abundant side cannot spam, because the swipe that matters has a price on it.

01

Post the song, name the hole

Horns on this. A lyricist. Someone to sing the hook. Key, BPM, reference, deadline. No call can be posted without terms attached, so "exposure" never appears in the interface.

02

Cast from a contact sheet

Ten to twenty players who fit that brief, never an infinite pool. Sound on by default, opening on the hook. The clip that plays is the one relevant to your song, so the audio is the decision and the photo is only the hook.

03

Circle them and it is real

Right swipe sends the offer with the terms already on it. They accept or counter once. Accept signs the split sheet, cash goes to escrow, and the project room opens.

The two sides, and the joke

Which side of the table

Picking a side flips the feed, the button and the notifications, so it behaves like a mode rather than a setting. Most working musicians pick both.

I'M CASTING
i have the song. audition for me.
You post calls and swipe players. Your right swipe carries the money, so you get fifteen of them per call.
I'M AUDITIONING
put me in your song.
You swipe calls. The ones whose caster already circled you are flagged and shown first, because those are guaranteed callbacks.
BOTHDepends on the night.
No call without terms

Three ways to pay, chosen before anyone swipes

The deal type gates every field after it, so this is a branching wizard and never a long form. Ambiguity about credit and stems is the number one grievance after a session, so the free option spells all three out.

FOR THE LOVE

Credit on the release, stems for their reel, and the right to post sixty seconds. Three explicit toggles, because "I'll credit you" means nothing.

CASH · $400

One figure, agreed before anyone swipes. The player is quoted $400 and the caller is charged $440, so the ten percent never comes out of the take. Held in escrow at match, released on delivery, auto released fourteen days later if the caster goes quiet. Work for hire by default, said in plain English.

12% OF THE SONG

Composition and master shown separately, always, because conflating them is where litigation starts. IPI and PRO are blocking fields. No IPI means the money sits unmatched at the MLC.

Observed 2026 rates for one remote overdub. The AFM Single Song Overdub floor is $100 per track, which is a legal floor and not a market rate. Tambr takes 10% from the hirer on cash and nothing on points.
RoleMarket rangeDefault offer
Vocalist$75 to $1,500+$250
Horns and strings$75 to $900+$200
Guitar, bass, drums$50 to $800+$175
Topline writer$150 to $1,000+$300
Mixing engineer$100 to $2,500$400
The build

Twenty two screens, shot in the dark

The app runs on film black so the faces and the money are the only lit things in it. Amber edge print, a red grease pencil that circles a face the way a casting director marks a contact sheet, and a swipe budget you can count at a glance. Paper appears on exactly four screens, the ones where you sign something, and the switch to white is the point.

The white flip

Four screens on paper, and only four

you swipe in the dark. you sign on paper.
The growth engine

Two cards that recruit with nobody on the network

The casting call card works before Tambr has a single counterparty, because a musician can hear the song and see the money without an account. The booked card is the receipt, posted by both sides, and it recruits a caster and a player with one share.

Go to market

The scarce side is casters, and it is not close

SoundBetter's own pagination gives the count. Players are not merely abundant, they are glutted, so every dollar goes to acquiring people who have a finished song, a budget, and a hole in it.

Producers
517 pages
Topline
172 pages
Trumpet
7 pages
Horns
6 pages
01

Seed the abundant side first

The Tinder sorority move. Players are easy to recruit and the stack has to be full before a caster ever opens it.

02

Recruit casters by hand

The DoorDash move. Match the first fifty calls manually, one at a time, before any algorithm exists.

03

Rewrite every brief

The Airbnb photography move, applied to language. A vague call is the churn mechanism, so nobody sees one until it has been rewritten.

The risk, stated plainly

Every one of these died the same way

They solved the introduction and never built the transaction. Vampr had the swipe, the audio profiles and 1.4 million users, then sold for under three million dollars. Demand is not the question. Musicians already pay each other through Reddit, Discord and a freelancing site built for web developers.

Vampr1.4M users, no transaction layer, sold under $3M
BandHubDead. Profile rot, no quality signal
KompozCollaboration as file transfer
ProCollabsUnit economics never covered moderation
JoinMyBandGeography first, song never
BandmixA directory, not a marketplace