In the big fight at the club, one of the attacking demons throws an energy ball that Paige calls for and throws back at them. A common defense used by Prue, this is the first time that Paige uses this tactic to vanquish a demon. It is also the first time in the series that Paige vanquished a demon on her own.
The demon that gets killed in this episode is the darklighter that was killed by the demon Eames in the season 3 episode Blinded by the Whitelighter.
Leo says he is trying to sense the sisters, but when he's under the impression they are in the underworld, but it has been previously mentioned he can't sense them, or hear their calls in the underworld, only if he were in the underworld with them.
TRIVIA: This is the 3rd time that a warlock uses a ring for evil. The other episodes were That '70s Episode in season 1 and Heartbreak City in season 2.
TRIVIA: The Ring of Inspiration, that Devlin has looks like the one worn by Cupid (and Drasi) in the season 2 episode Heartbreak City.
(After Cole saves Phoebe from Devlin)
Phoebe: Thank you for coming.
Cole: Thank you for having me.
Paige: That's a rhyme.
Phoebe: Yeah, I'm sorry. Now is not the time. (catches herself) Oh!
Phoebe: It's about good verses evil, wrong verses right, and our job as witches to fight the good fight.
Piper: Dr. Seuss is that you?
Phoebe: Piper, aren't you forgetting something?
Piper: Oh! They're still frozen aren't they?
Phoebe: Oh, no, did we get sent back in time again?
Piper: No, Phoebe, we're at P3. I think.
Paige: Oh my god, forties night looks amazing.
Phoebe: Okay, so just start cooking and let that inspire you.
Piper: Now she's Martha Stewart.
Cole: You're pretty young, Piper. Are you really ready to die?
Phoebe: I don't know how to be a wife. (Cole kisses her) But I can't live without you in my life. (They kiss again)
Paige: Did she rhyme? I think she just rhymed.
Cole: I-I know you're, I know you're mad but before you say anything we, ah, found out that the faction leader is a warlock named, uh, Devlin.
Phoebe: Ha, he looked more like a Joe to me.
Phoebe: Cole is nowhere to be found.
Piper: And Leo still isn't answering.
Phoebe: I can't believe they'd do this.
Paige: Do what exactly?
Piper: The only reason Leo wouldn't hear us calling is if he went underground, with Cole.
Paige: I'd rather do battle with warlocks than do battle with the two of you.
Paige: Now that I have something to focus on, I think I can call for the ring.
Phoebe: It's brilliant. The ring will orb to you, and then if he wants it back, he'll have to come follow it.
Piper: Which is when we hit him with the potion.
Phoebe: And make a huge commotion.
Piper: I got potions, whose got a spell?
Phoebe: Evil is a faithful foe, but good does battle best. We witches will, with these words, waste the warlocks evil zest.
Piper: Wonderful. Witty, but wordy.
Phoebe: A warlock is a funny thing, he blinks from place to place, and when we say these words to him, his face they will erase.
Paige: It sounds more like a limerick than a spell.
Piper: Cole, you're struggling, right? Trying to figure out how to be this new person.
Cole: I thought we were here to talk about warlocks.
Piper: What you don't get is that Phoebe is trying to do the exact same thing. She's always been the youngest sister, the eternal child. Carefree, fun loving.
Leo: And in a minute, she lost Prue, discovered Paige, and became the middle sister.
Piper: And to top it all off, you propose. The idea of marriage, being that much of a grownup, is terrifying to Phoebe.
Cole: Did she say that?
Piper: No, she didn't have to, I'm her big sister, I've known her only, oh, her whole life.
Paige: What was that?
Cole: That was a warlock.
Piper: Was that the warlock that captured your friend?
Phoebe: They must be working together.
Cole: And that, ladies and gentlemen, is what you call a faction.
Phoebe (referring to Cole's handgun): What are you doing with that?
Paige: Get that thing out of here.
Cole: Oh, come on, you guys see worse than this every day.
Phoebe: No, we see demons every day, there is a huge difference.
Cole: There is, how?
Paige: Uh, for one thing, we're not likely to accidentally vanquish ourselves.
Paige: Who's attacking us?
Piper: No one.
Paige: Right on, I get the weekend off.
Piper: See now that is the spirit.
Piper: If there was such a thing as a protection potion we'd be mixing it in our morning coffee.
Piper: How was the big date?
Phoebe: Great. Fine. It was okay.
Devlin: There's nothing worse then an uninspired politician.
Cole: I don't know if sending your sisters away was a good idea. I don't have powers anymore, and I can't protect you if there's an attack.
Phoebe: Well, my sisters are in calling range, and more importantly, I'm in kissing range.
Phoebe: That was a toast and usually after the clinking part you take a little sip.
Piper: Great, well, I say the only good Source is a dead Source.
Paige: Who's going to kill us?
Piper: No one.
Paige: That's new.
Piper: Suddenly I'm beginning to miss the Source.
Phoebe: This is perfect. We need a theme. You're an artistic, creative type.
Paige: A theme?
Phoebe: Yeah, I'll explain on the way. Us theme, you potion.
Piper: Me peeved, you annoying.
Leo: Cole, I get that this is hard for you, but I need you to do me a favor and shut up.
Phoebe: Where are you going?
Piper: Uh, P3.
Phoebe: At 9:00 in the morning? Don't club kids sleep in?
Piper: Corporate party, big money, total nightmare.
Phoebe: Uh, what if there's an attack?
Piper: At 9 a.m.? Don't demons sleep in?
Piper: Now that I know what we're up against I can practically taste the potion. I don't know what it does, but it tastes pretty good.
Leo: Okay, so what exactly are you doing now?
Phoebe: Basking in the brilliance of our failure.
Phoebe: That does not mean we can just lay down and play dead.
Piper: I don't think we're gonna have to play.
This episode scored 4.5 million viewers.
Guest star Graham Shiels (Shapeshifter) also played the darklighter in the episode Blinded by the Whitelighter.
International Episode Titles: Australia: The Sistership of the Ring Czech Republic: Polibek múzy (Kiss of the Muse) France: L'union fait la force (Unity is strength) Italy: L'ispirazione (The inspiration) Germany: Der Ring der Musen (The ring of muses)
Phoebe: You already have this whole Veronica Lake thing going on.
This is a reference to the famous actress from the 1940s, who had a fairly brief but good career. She was particularly known for the way she wore her hair - the 'peekaboo', as it was called - with hair covering her right eye.
Title: Muse to My Ears
This is a reference to the common saying "music to my ears", meaning when they like what they hear.