How many vocaloids songs are there?

As of this post 8 Aug, 2012, at a minimum, there are over 120,000 songs using Vocaloid.

On the Japanese website, Nico Nico Douga (the central hub of Vocaloid music and videos), we get these numbers:

1. 84,000+ original songs tagged with "Vocaloid" and "オリジナル曲" (original_song).

2. 47,000+ cover songs tagged with "Vocaloid" and "カバー曲" (cover_song).

Take the above 120,000+ songs from that website alone and consider the following:

1. Add all the potential Nico Nico Douga videos that were tagged incorrectly.

2. Add any original songs and covers from YouTube that are not reprints of existing videos.

3. All other websites that have original music and covers using Vocaloid.

The number is possibly much higher than 120,000.