Dreamteam67: I don't have a comprehensive list, but you have pretty much figured it out. Look at the spell descriptions, and ones that will benefit from caster level and/or get harder to resist with heighten spell are the way to go imo. The others can be read as scrolls. Personally I generally go for most of the Enchantment school spells, and the buffs that stack or scale (can't remember if Heroism + GH stack, but they likely do). Buffs are generally more reliable than debuffs imo, unless you have a specific build that overcomes enemy saves and MR (for example school specialization and penetration feats).
Greater version makes Heroism obsolete, bonuses from same source (here: morale) don't stack (so it competes with Inspire Courage and Inspire Heroics, but fear immunity may be this spell selling point). Seeing my bard as mainly a caster, I picked up SF and GSF Enchantment along with SP and GSP, which should allow me to use debuffs like Confusion or Crushing Despair on most enemies.
Dreamteam67: The obvious choices to consider for 1st level spells are Cause Fear, Charm Person, Confusion, Grease, Sleep and Tashas Laughter imo.
But the level 2nd, 3rd and 4th levl spells really depends on your bard build strategy imo (see my original post in this thread for suggestions). Glitterdust is nice because it ignores enemy MR iirc, but that becomes mostly relevant for fighting demons or other MR creatures.
Both Grease and Glitterdust ignore magic resistance, or so I've read somewhere. Glitterdust is my obvious 2nd level spell choice, it's so good right from the start.
Dreamteam67: The cure spells are a tough choice, because it is nice to have a bard that can cast hem, but they don't benefit from heighten spell nor require a save. SO technically it would be better to have a cleric NPC who can scribe/brew some healing scrolls/potions for you every once in a while, then kick him from the party. But it's more convenient to cast them from memory.
The higher level mass-X spells would depend on your party composition. For example, mass-Cat's Grace would be a nice buff for your party of rogues.
Convenience is important :) And being one and only active healer, my bard should have some, if not all. I will probably get rid of lesser ones, but serious, critical and mass are good to have. Maybe later I will convince someone from St. Cuthbert temple to scribe me some scrolls, or even craft a wand or two (again, convenience, and no AoO when using wands). Enhancement spells are nice, but so are Gloves of Dexterity +6, Belt of Giant Strength +6 or Cloak of Charimsa +6 - not only they free a spell slot, but also provide higher stat bonus. They cost a bit, but aren't that hard to craft, and should be available around the level bard gets mass versions of appropriate spells.
Unfortunately, level 5 and 6 spells aren't that great, and I guess there is no Irresistible Dance in ToEE.
Dreamteam67: One of your best HL "spells" is your fascinate song imo. It is insanely OP when used properly.
Could you elaborate more on this topic? I know it's a good disabler in ToEE. Something to do with Suggestion on fascinated foes, or just by itself?
Dreamteam67: Scribing higher level spells cost more gold + exp. You can farm exp + gold if you dominate Ranos Davl (or alternatively any other shopkeeper, talk to him and re-sell stuff) or Smegmal Redhand (each time you talk to her in her chamber while dominated, 2 HL assassins appear with lootable magic weapons). Also walking back and forth on the road between Nulb and Emridy Meadows has a high chance of encountering 4 Ettins, who give 400 (or 800?) exp each iirc.
I walked 500 miles to Nulb and back, hunting ogres, ettins and even vodyanoi. There was one BIG encounter with around 5-6 ettins and 3-4 ogres with a chieftain or two. I will check those assassins, too, my bows needs upgrades :)
Dreamteam67: You will only notice it on level-up because there will be a box around a spell you already know in your spell list, allowing you to change it. Otherwise there is no prompt to do so.
Probably a bug, such option wasn't available on my first attempt, but after closing and starting game again, it appeared. Still, I could only exchange one spell (and pick one new on higher level), hmmm...
Dreamteam67: It depends. In my playtesting, pure bards couldn't read a healing scroll written by a cleric and vice versa. But this was pre-Temple+ mod, so you might test it first to see if that has been changed. Or it could be some of the scrolls you find in the temple might be "neutral" and readable by anyone.
Maybe Temple+ "fixed" it, then? I will do some more testing. The scroll wasn't usable by a crafter wizard. In the end, 20th level of bard may be still an option :)