Lively music, I agree, and singular — we weren’t bored in vain! (9,5)

'we weren't bored in vain' is the definition.
(a discovery well might be bored for oil)

'lively music i agree and singular' is the wordplay.
'lively music' becomes 'disco' (disco is a music genre).
'i agree' becomes 'very well' (both might be said to express agreement).
'and' says to put letters next to each other.
'singular' becomes 's' (abbreviation sometimes used in dictionaries).
'disco'+'verywell'+'s'='DISCOVERY WELLS'