Logical Entry: Bard 2/Druid 6/Rogue 2, or something like that. Optionally, replace the second Bard level with Wizard or Sorcerer or something for better casting.
Cons: The entry, and only the entry. It's like Mystic Theurge but you're losing 4 caster levels on one side instead of 3, and at least 6 on the other side. The skill requirements are pretty serious (6 different skills on top of needing Concentration as a spellcaster, and most of those skills granted by very few classes). Bardic Knowledge pretty much forces you to take at least one Bard level. Evasion pretty much forces you to take at least 2 Rogue or Monk levels (Rogue helps more with the skills). The ability to speak Druidic and first level divine spells requires a Druid level, usually. First level arcane spells means you need either a second level of Bard or a dip into Wizard or the like. 13 ranks in Perform means you can't enter until after 10th at the earliest, so you don't have any levels afterwards to build off of your dual progression, and all the multiclassing you've done so far means you can't qualify for Mystic Theurge or Arcane Heirophant early enough to salvage your spellcasting.
Pros: Once you're in, life is great (or would be if you didn't have to sacrifice so so much to get there). Full dual progression of spellcasting, full BAB, 6 skill points, bardic knowledge and music progression, and, as a bonus, you can wear metal armor (though not shields for some reason, probably an unintentional omission) and get to ignore the multiclassing XP penalty rules that nobody plays with. Give it a good Fort save and a d12 HD and it would be a gestalt character's ideal. If you can find a way into this class without a horrible entry (Loremaster can, arguably, give Druidic and Bardic Knowledge, a Ring of Evasion, the Impulse Boots soulmeld, and the Loredelver PrC can get you Evasion without losing CLs, early entry into Mystic Theurge to keep two spellcasting classes up, etc.), it's a pretty good chassis.
By the way, I accidentally repeated "that" twice in a row in the pros section on Apostle of Peace ("isn't that that terrible").