As a music theory expert with extensive experience in ear training, I can certainly guide you through the process of identifying the key of a song by ear. It's an essential skill for musicians, composers, and anyone interested in music analysis. Here's a detailed step-by-step guide to help you develop this skill:

### Step 1: Find the Tonic Note
The tonic is the first note in a musical scale and serves as the 'home base' for a piece of music. It often feels like a place of resolution or rest within a song. To find the tonic, listen for the note that seems to be the most stable and to which other notes seem to gravitate.

### Step 2: Test the Tonic
Once you've identified a note that could be the tonic, test it by humming or playing it along with the song. If it sounds like it fits in well with the melody and chords, it's likely the tonic.

### Step 3: Determine Major or Minor
After finding the tonic, you need to determine if the song is in a major or minor key. This can often be felt by the mood of the song. Major keys tend to sound happy or triumphant, while minor keys often sound sad or serious. You can also test this by playing a major or minor chord built on the tonic and seeing which one fits better.

### Step 4: Test Some Chords
Chords are combinations of notes played simultaneously. By testing some chords, especially those that are part of the song, you can get a better sense of the key. Start with triads (three-note chords) built on the tonic, then move to other chords that are part of the key.

### Step 5: Sing Along
Singing along with the song can help you internalize the melody and the key. As you sing, pay attention to how your voice interacts with the music and how the notes resolve back to the tonic.

### Step 6: Practice Your New Skill
Like any skill, identifying the key of a song by ear takes practice. Start with simple songs that are clearly in a major or minor key and gradually work your way up to more complex pieces.

### Step 7: Check Your Findings
Finally, once you think you've identified the key, check your findings. If you're working with a song you know well, you can compare your findings with the original key. If not, you can use a piano or a digital keyboard to verify your findings by playing the scale that corresponds to the key you've identified.

Remember, this is a skill that will improve over time with consistent practice. It's also important to have a good understanding of music theory to complement your ear training.

Now, let's move on to the translation of the above response into Chinese.

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Part 3 Finding The Key By EarFind the tonic note. The tonic, or first note in the scale, will sound right just about anywhere in the song. ... Test the tonic. ... Determine if the song is in a major or a minor key. ... Test some chords. ... Sing along with songs. ... Practice your new skill. ... Check your findings.read more >>