Public/Get-ShellPhishSongs.ps1

function Get-ShellPhishSongs {
    <#
    .SYNOPSIS
        Retrieve song records from Phish.net.
    .DESCRIPTION
        Returns all songs, or a single song by ID or slug.
    .PARAMETER ApiKey
        Your Phish.net API key. Defaults to $env:PHISH_KEY.
    .PARAMETER Id
        Numeric song ID.
    .PARAMETER Slug
        URL slug of the song.
    .EXAMPLE
        PS C:\> Get-ShellPhishSongs
    .EXAMPLE
        PS C:\> Get-ShellPhishSongs -Slug tweezer
    #>

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

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

        [Parameter(ParameterSetName='ById', Mandatory=$true)]
        [string]$Id,

        [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) {
        'ById'   { $endpoint = "songs/$Id.$Format" }
        'BySlug' { $endpoint = "songs/slug/$Slug.$Format" }
        default  { $endpoint = "songs.$Format" }
    }

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