I already made an application to do this in Visual Basic .. awhile ago actually.
Since I dont have Visual Basic installed anymore, here's that the .frm file gave me.
Attribute VB_Name = "Form1"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Option Explicit
Private Declare Function SendMessage Lib "user32" Alias "SendMessageA" (ByVal Hwnd As Long, ByVal wMsg As Long, ByVal wParam As Long, ByVal lParam As Long) As Long
Private Declare Function FindWindow Lib "user32" Alias "FindWindowA" (ByVal lpClassName As String, ByVal lpWindowName As String) As Long
Private Declare Function FindWindowEx Lib "user32" Alias "FindWindowExA" (ByVal hWnd1 As Long, ByVal hWnd2 As Long, ByVal lpsz1 As String, ByVal lpsz2 As String) As Long
Private Type COPYDATASTRUCT
dwData As Long
cbData As Long
lpData As Long
End Type
Private Const WM_COPYDATA = &H4A
Public Sub SetMusicInfo(ByRef r_sArtist As String, ByRef r_sAlbum As String, ByRef r_sTitle As String, Optional ByRef r_sWMContentID As String = vbNullString, Optional ByRef r_sFormat As String = "{0} - {1}", Optional ByRef r_bShow As Boolean = True)
Dim udtData As COPYDATASTRUCT
Dim sBuffer As String
Dim hMSGRUI As Long
sBuffer = "\0Music\0" & Abs(r_bShow) & "\0" & r_sFormat & "\0" & r_sArtist & "\0" & r_sTitle & "\0" & r_sAlbum & "\0" & r_sWMContentID & "\0" & vbNullChar
udtData.dwData = &H547
udtData.lpData = StrPtr(sBuffer)
udtData.cbData = LenB(sBuffer)
Do
hMSGRUI = FindWindowEx(0&, hMSGRUI, "MsnMsgrUIManager", vbNullString)
If (hMSGRUI > 0) Then
Call SendMessage(hMSGRUI, WM_COPYDATA, 0, VarPtr(udtData))
End If
Loop Until (hMSGRUI = 0)
End Sub
Private Sub Command1_Click()
SetMusicInfo "WHATEVER YOU WANT HERE", "album", "THIS TXT IS AFTER THE HYPHEN"
End Sub

Use it how ever you want.
Mainly, edit this line: SetMusicInfo "WHATEVER YOU WANT HERE", "album", "THIS TXT IS AFTER THE HYPHEN"
So your personal message will be a link, but, in this case, would say:
WHATEVER YOU WANT HERE - THIS TXT IS AFTER THE HYPHEN
Atleast I think that is what you're aiming for .. lol, good luck.