BARDS AND FASCINATE - A Bard is usually the "go to" guy when mobs start to attack RuneScape Gold forcefully thus becoming unmanageable. It's the class that's arguably the best in using Crowd Control tactics. And the one thing that makes a Bard different from Wizard, Sorcerer and Cleric, is in the use of "Fascinate" skills.
For Bards, the use of Fascinate renders mobs (creatures) immobile hence unable to attack the party. The song that Bard plays will have this effect on monsters but note that the effect only happens towards the end of the song and not immediately (as wrongly assumed by some players).
The fascinated mobs remain in that state until they are attacked. So, party members should refrain from hitting the fascinated creatures, otherwise the party would have to contend with mobs hitting back and hitting back hard.
But if a Bard uses Otto's dance, you shouldn't worry about accidentally hitting the creatures as they would remain fascinated no matter what you do with them. When they start their foot shuffling and tapping, they are helpless.
Using Fascinate does not use up spell points, which can only be a good thing for a Bard? When creatures are fascinated, the group doesn't need to cast spells, hence saving up on spell points as well. There's also less need to heal up members as there are no hostile mobs attacking.