Public/Get-ShellPhishJamCharts.ps1

function Get-ShellPhishJamCharts {
    <#
    .SYNOPSIS
        Retrieve jam chart records from Phish.net.
    .DESCRIPTION
        Returns jam chart entries by song ID or song slug.
    .PARAMETER ApiKey
        Your Phish.net API key. Defaults to $env:PHISH_KEY.
    .PARAMETER SongId
        Numeric song ID.
    .PARAMETER Slug
        URL slug of the song (e.g. makisupa-policeman).
    .EXAMPLE
        PS C:\> Get-ShellPhishJamCharts -Slug makisupa-policeman
    #>

    [CmdletBinding(DefaultParameterSetName = 'Default')]
    param (
        [Parameter(Position=0)]
        [string]$ApiKey = $env:PHISH_KEY,

        [Parameter()]
        [ValidateSet('json','xml','html')]
        [string]$Format = 'json',

        [Parameter(ParameterSetName='BySongId', Mandatory=$true)]
        [string]$SongId,

        [Parameter(ParameterSetName='BySlug', Mandatory=$true)]
        [string]$Slug,

        [Parameter()][string]$OrderBy,
        [Parameter()][ValidateSet('asc','desc')][string]$Direction,
        [Parameter()][int]$Limit,
        [Parameter()][switch]$NoHeader
    )

    switch ($PSCmdlet.ParameterSetName) {
        'BySongId' { $endpoint = "jamcharts/songid/$SongId.$Format" }
        'BySlug'   { $endpoint = "jamcharts/slug/$Slug.$Format" }
        default    { $endpoint = "jamcharts.$Format" }
    }

    $qp = Get-CommonQueryParams -OrderBy $OrderBy -Direction $Direction -Limit $Limit -NoHeader:$NoHeader
    Invoke-ShellPhishApi -Endpoint $endpoint -QueryParams $qp -ApiKey $ApiKey
}