Script

local UserInputService = game:GetService("UserInputService")
local Player = game.Players.LocalPlayer

local Seat = workspace:WaitForChild('Seat')                             -- Where the seat is
Active = false

function onInputBegan(input,gameProcessed)
    if input.KeyCode == Enum.KeyCode.C then                             -- Which button
        if Seat.Occupant and Seat.Occupant.Parent.Name == Player.Name
then
            Active = true
        end
    end
end

function onInputEnded(input,gameProcessed)
    if input.KeyCode == Enum.KeyCode.C then                             -- Which button
        if Seat.Occupant and Seat.Occupant.Parent.Name == Player.Name
then
            Active = false
        end
    end
end

Seat.Changed:Connect(function(Prop)
    if Prop == 'Occupant' then
        local Occupant = Seat.Occupant
        if Occupant then
            -- Nothing
        else
            Active = false --> Player left the seat
        end
    end
end)

UserInputService.InputBegan:connect(onInputBegan)
UserInputService.InputBegan:connect(onInputEnded)

while wait() do
    if Active == true then
        game.SoundService.Sound.Playing = true                          -- Code
    end
end