It implies that he can't sing very well, but for some reason he thinks he can, and this belief in his own singing ability will result in him singing frequently. The speaker thinks this is a bad thing.
New words, one handy idiom, and a 2-minute quiz — delivered to your inbox to keep your streak alive.
ReegisI am just asking about could used in this sentence.In itself "can" or "could" does not include the idea of "well", but with special talents the word "well" often has to be assumed if it is omitted.