Can a Glamour Bard use the Enthralling Performance ability while casting Motivational Speech?

Question

Can the following two mechanics work together or are they mutually exclusive or require something else? I am the DM. Both the player at my table and I don't agree or understand if it's possible to utilize Enthralling Performance in conjunction with the spell motivational speech.

Enthralling Performance (Glamour Bard ability)

Starting at 3rd level, you can charge your performance with seductive, fey magic.

If you perform for at least 1 minute, you can attempt to inspire wonder in your audience by singing, reciting a poem, or dancing. At the end of the performance, choose a number of humanoids within 60 feet of you who watched and listened to all of it, up to a number equal to your Charisma modifier (minimum of one). Each target must succeed on a Wisdom saving throw against your spell save DC or be charmed by you. While charmed in this way, the target idolizes you, it speaks glowingly of you to anyone who speaks to it, and it hinders anyone who opposes you, avoiding violence unless it was already inclined to fight on your behalf. This effect ends on a target after 1 hour, if it takes any damage, if you attack it, or if it witnesses you attacking or damaging any of its allies.

If a target succeeds on its saving throw, the target has no hint that you tried to charm it.

Motivational Speech (Acquistions Incorporated, p.77)

3rd-level enchantment
Casting Time: 1 minute
Range: 60 feet
Components: V
Duration: 1 hour

You address allies, staff, or innocent bystanders to exhort and inspire them to greatness, whether they have anything to get excited about or not. Choose up to five creatures within range that can hear you. For the duration, each affected creature gains 5 temporary hit points and has advantage on Wisdom saving throws. If an affected creature is hit by an attack, it has advantage on the next attack roll it makes. Once an affected creature loses the temporary hit points granted by this spell, the spell ends for that creature.

Does using one of these preclude using the other at the same time?

Answer 1

It is up to the DM, though seems unlikely.

Motivational Speech does not say in its description that it is a performance. This means it does not fulfill the requirements to perform for a minute in order to use Enthralling Performance. If the DM were to rule that it does count as a performance then the rules on casting come into play.

To cast Motivational Speech requires only a Verbal component, and 1 minutes of casting.

Longer Casting Times

Certain spells (including spells cast as rituals) require more time to cast: minutes or even hours. When you cast a spell with a casting time longer than a single action or reaction, you must spend your action each turn casting the spell, and you must maintain your concentration while you do so. If your concentration is broken, the spell fails, but you don't expend a spell slot. If you want to try casting the spell again, you must start over. (Player's Handbook, Chapter 10, pg 202)

I have emphasized the most important part of the description, that you must spend your action each turn casting the spell and you must maintain concentration. Now concentration isn't really an issue as Enthralling Performance does not require concentration.

However, the Components section on Spells states that for Verbal:

Most spells require the chanting of mystic words. The words themselves aren't the source of the spell's power; rather, the particular combination of sounds, with specific pitch and resonance, sets the threads of magic in motion. (Player's Handbook, Chapter 10, pg 203)

Casting Motivational Speech is not just the Bard saying/doing something motivational, it also requires them to mix in mystic words which cause their words to have a motivational affect. What inspires the targets of Motivational Speech is not the words said, it is the magic behind them. One could rule that performing at the same time as casting the spell would cancel it as they are not spending their action chanting mystic words to cast the spell.

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Another thing to mention is the Wisdom save for Enthralling Performance, and the Advantage on Wisdom saves provided by Motivational Speech. If you were to allow both of them to be cast in the same minute, you could rule that they have advantage on their Wisdom save for Enthralling Performance. As a result, you could suggest that they actually perform Enthralling Performance first, and then cast Motivational Speech if they don't want that affect to stack.