For maximum progress:
Many public libraries or Goethe-Instituts lend out the Sicher B1 coursebook with its accompanying CD-ROM. You can legally rip the CD to your computer as MP3s for personal use. sicher b1 audio download work
Hueber provides free, legal access to most audio tracks for Sicher B1 (Kursbuch – Coursebook). sicher b1 audio download work
Steps to download: