I don't see any real issue other than TNT wasn't found. It's probably because of the periods in the name in your tag (T.N.T.). It also appears that Xbmc only found a single artist name in your tags AC/DC.
What songs appear in your ACDC artist? Look at the tags for those songs.
grep GRABBER M*
Code:
23:37:14 T:2972 M:2013040640 DEBUG: MUSIC_GRABBER::CMusicInfoScraper::FindArtistinfo: Searching for 'AC/DC' using Allmusic scraper (file: 'allmusic.xml', content: 'albums', language: 'en', date: '2009-09-30', framework: '1.1')
23:37:20 T:1512 M:2013306880 DEBUG: MUSIC_GRABBER::CMusicInfoScraper::FindAlbuminfo: Searching for 'AC/DC - '74 Jailbreak' using Allmusic scraper (file: 'allmusic.xml', content: 'albums', language: 'en', date: '2009-09-30', framework: '1.1')
23:37:28 T:6088 M:2013646848 DEBUG: MUSIC_GRABBER::CMusicInfoScraper::FindAlbuminfo: Searching for 'AC/DC - AC/DC Live' using Allmusic scraper (file: 'allmusic.xml', content: 'albums', language: 'en', date: '2009-09-30', framework: '1.1')
23:37:34 T:4488 M:2014113792 DEBUG: MUSIC_GRABBER::CMusicInfoScraper::FindAlbuminfo: Searching for 'AC/DC - Back in Black' using Allmusic scraper (file: 'allmusic.xml', content: 'albums', language: 'en', date: '2009-09-30', framework: '1.1')
23:37:38 T:4436 M:2015088640 DEBUG: MUSIC_GRABBER::CMusicInfoScraper::FindAlbuminfo: Searching for 'AC/DC - Ballbreaker' using Allmusic scraper (file: 'allmusic.xml', content: 'albums', language: 'en', date: '2009-09-30', framework: '1.1')
23:37:44 T:4768 M:2015711232 DEBUG: MUSIC_GRABBER::CMusicInfoScraper::FindAlbuminfo: Searching for 'AC/DC - Black Ice' using Allmusic scraper (file: 'allmusic.xml', content: 'albums', language: 'en', date: '2009-09-30', framework: '1.1')
23:37:49 T:5672 M:2015756288 DEBUG: MUSIC_GRABBER::CMusicInfoScraper::FindAlbuminfo: Searching for 'AC/DC - Blow Up Your Video' using Allmusic scraper (file: 'allmusic.xml', content: 'albums', language: 'en', date: '2009-09-30', framework: '1.1')
23:37:54 T:1220 M:2015866880 DEBUG: MUSIC_GRABBER::CMusicInfoScraper::FindAlbuminfo: Searching for 'AC/DC - Dirty Deeds Done Dirt Cheap' using Allmusic scraper (file: 'allmusic.xml', content: 'albums', language: 'en', date: '2009-09-30', framework: '1.1')
23:37:59 T:4924 M:2015555584 DEBUG: MUSIC_GRABBER::CMusicInfoScraper::FindAlbuminfo: Searching for 'AC/DC - Highway to Hell' using Allmusic scraper (file: 'allmusic.xml', content: 'albums', language: 'en', date: '2009-09-30', framework: '1.1')
23:38:04 T:5224 M:2018152448 DEBUG: MUSIC_GRABBER::CMusicInfoScraper::FindAlbuminfo: Searching for 'AC/DC - Let There Be Rock' using Allmusic scraper (file: 'allmusic.xml', content: 'albums', language: 'en', date: '2009-09-30', framework: '1.1')
23:38:08 T:5280 M:2020745216 DEBUG: MUSIC_GRABBER::CMusicInfoScraper::FindAlbuminfo: Searching for 'AC/DC - Powerage' using Allmusic scraper (file: 'allmusic.xml', content: 'albums', language: 'en', date: '2009-09-30', framework: '1.1')
23:38:16 T:524 M:2021048320 DEBUG: MUSIC_GRABBER::CMusicInfoScraper::FindAlbuminfo: Searching for 'AC/DC - T.N.T.' using Allmusic scraper (file: 'allmusic.xml', content: 'albums', language: 'en', date: '2009-09-30', framework: '1.1')
23:38:23 T:524 M:2020098048 ERROR: MUSIC_GRABBER::CMusicInfoScraper::FindAlbuminfo: Unable to retrieve web site
23:38:23 T:5468 M:2018316288 DEBUG: MUSIC_GRABBER::CMusicInfoScraper::FindAlbuminfo: Searching for 'AC/DC - Who Made Who' using Allmusic scraper (file: 'allmusic.xml', content: 'albums', language: 'en', date: '2009-09-30', framework: '1.1')