Downloading songs from Spotify for free is against Spotify's terms of service and may be illegal in your country. It's important to respect the rights of artists and creators, who earn their living from the revenue generated by their music.

However, Spotify offers a premium subscription service that allows you to download songs for offline listening. Here's how you can do it:

1. Subscribe to Spotify Premium: You can do this through the Spotify website or the app.

2. Download the Spotify app: If you haven't already, download and install the Spotify app on your device.

3. Log in to your account: Use your Spotify Premium account details to log in.

4. Find a playlist or album: Browse or search for the music you want to download.

5. Download the music: Toggle the "Download" switch on. The songs in the playlist or album will begin to download to your device.

Remember, these songs are not technically yours. They are available for offline listening as long as you have an active Spotify Premium subscription.