The phrase "already listened" is correct and usable in written English.
It can be used to indicate that someone has completed the action of listening to something prior to the current moment.
Example: "I have already listened to the podcast you recommended, and I found it very insightful."
Alternatives: "have previously listened" or "have already heard".
She has already listened to that day's dialogue, which arrived as a free podcast, on her iPod.
It's only my first day at conference, the leadership race is just starting to hot up and I've already listened to two successive MPs tell the audience that they're not allowed to be bigoted or sexist.
Experts in the law on interception dismissed as "nonsense" the claim by Yates that the hacking into voicemails could not be investigated if the victim had already listened to messages.
The "narrow" interpretation of the Regulation of Investigatory Powers Act 2000, that it was not a crime to eavesdrop messages already listened to by their intended recipient, "was misleading not on a minor point, but on the most substantial point of all".
When Surrey police first listened to Milly's messages on Tuesday 26 March, they found only one voicemail, which had been left earlier that day – and it had been stored in the saved folder, suggesting that somebody had already listened to it.
A Department for Work and Pensions spokesperson said: "The government has already listened to concerns expressed by those affected by the 2011 changes, and took action to limit the maximum change to state pension age to 18 months, a concession worth over £1bn.
For example, most of the streaming music services now put new music in front of listeners based on what they already listen to, augmented by what fellow fans alternately consume.
Perhaps you are already listening deeply inside.
How many of you already listen to classical music?
For the most part, people hear about new podcasts from other podcasts they already listen to.
The Bush transition team is already listening to state concerns on environmental issues.
