I found a way to get the popbars numerically.
If programmers are lurking, you have to use this link
http://itunes.apple.com/WebObjects/M...Top?genreId=34
And add request properties
User-Agent: iTunes
X-Apple-Store-Front: 143441
The store front is to choose the country (like 143441 for US and 143452 for NL)
Then you can parse the output which looks like
<key>artistId</key><integer>63346553</integer>
<key>artistName</key><string>Rihanna</string>
<key>bitRate</key><integer>256</integer>
<key>buyParams</key><string>productType=S&salableAdamId=402920 955&pricingParameters=PLUS&price=1290& origPage=Top%20Songs-US-Music&origPageLocation=Tracklist-Track&origPageCh=Top%20Songs</string>
<key>buy-params-256</key><string>productType=S&salableAdamId=402920 955&pricingParameters=PLUS&price=1290& origPage=Top%20Songs-US-Music&origPageLocation=Tracklist-Track&origPageCh=Top%20Songs</string>
<key>composerId</key><integer>272737448</integer>
<key>composerName</key><string>Mikkel S. Eriksen, Tor Erik Hermansen, Sandy Wilhelm & Esther Dean</string>
<key>discCount</key><integer>1</integer>
<key>discNumber</key><integer>1</integer>
<key>duration</key><integer>243443</integer>
<key>explicit</key><integer>0</integer>
<key>genre</key><string>Pop</string>
<key>genreId</key><integer>14</integer>
<key>itemId</key><integer>402920955</integer>
<key>itemName</key><string>S&M</string>
<key>kind</key><string>song</string>
<key>playlistId</key><integer>402920935</integer>
<key>playlistName</key><string>Loud</string>
<key>popularity</key><string>0.730563</string>
<key>preview-url</key><string>http://a1.phobos.apple.com/us/r1000/004/Music/e5/aa/a4/mzi.rehjbyhd.aac.ep.m4a</string>
<key>preview-url-256</key><string>http://a1.phobos.apple.com/us/r1000/004/Music/e5/aa/a4/mzi.rehjbyhd.aac.ep.m4a</string>
<key>previewLength</key><integer>90</integer>
<key>previewURL</key><string>http://a1.phobos.apple.com/us/r1000/004/Music/e5/aa/a4/mzi.rehjbyhd.aac.ep.m4a</string>
<key>price</key><integer>1290</integer>
<key>price-256</key><integer>1290</integer>
<key>priceDisplay</key><string>$1.29</string>
<key>price-display-256</key><string>$1.29</string>
<key>rank</key><integer>2</integer>
<key>releaseDate</key><string>2010-11-16T08:00:00Z</string>
<key>s</key><integer>143441</integer>
<key>sampleRate</key><integer>44100</integer>
<key>trackCount</key><integer>12</integer>
<key>trackNumber</key><integer>1</integer>
<key>url</key><string>http://itunes.apple.com/us/album/s-m/id402920935?i=402920955</string>
<key>year</key><integer>2010</integer>
