[aiwv]

Yeah, I was astounded by how quickly my singing improved when I started practicing with a metronome. Keeping time seems to me the easiest thing to improve if you focus on it (but that's just my subjective opinion). Once you can keep good time, the rhythm of the song imposes restrictions on you that actually help you figure out how to physically perform the movements demanded by the music and then subsequently groove them so that you can focus on all the other elements of making music.