Audio amplifier with strange open loop, is it an oscillator?
No, but it might have a little bit of ripple in it at 10MHz, the ripple will be small at -10dB is equal to 0.316 of gain, so a 10mV input frequency at 10MHz would then be 3.16mV of ripple. 

These 'bumps' in the amplifier frequency response are usually from parasitic values in the component or the feedback components. 

You could put another pole in the feedback path to get a -40dB/decade instead of -20dB/decade